Please give the solutions for "Mixed Practice" Set A Q.1 and Q.2 on page 430 of selina publications

Asked by aaryamehta46 | 14th Apr, 2017, 06:26: PM

Expert Answer:

begin mathsize 14px style straight Q 1
Let space the space Principal space be space Rs. space straight P space and space the space rate space of space interest space be space straight R percent sign space per space annum.
straight S. straight I. space for space 8 space years equals Rs. space 6400
rightwards double arrow straight S. straight I. space for space 1 space year equals 6400 over 8 equals Rs. space 800
rightwards double arrow straight S. straight I. space for space 2 space years equals Rs. space 1600
Also comma space straight C. straight I. equals straight S. straight I. space for space the space 1 st space year
rightwards double arrow straight C. straight I. space for space 1 space year equals Rs. space 800
It space is space given space that space straight C. straight I. space for space 2 space years equals Rs. space 1664
rightwards double arrow straight C. straight I. space for space the space 2 nd space year equals Rs. space 1664 minus Rs. space 800 equals Rs. space 864
Now comma space straight C. straight I. space for space 2 nd space year minus straight S. straight I. space for space 2 nd space year equals straight S. straight I. space on space the space interest space for space 1 st space year
rightwards double arrow straight S. straight I. space on space the space interest space for space 1 st space year equals Rs. space 864 minus Rs. space 800 equals Rs.64
rightwards double arrow straight S. straight I. space for space Rs. space 800 space for space 1 space year equals Rs. space 64
rightwards double arrow fraction numerator 80 cross times straight R cross times 1 over denominator 100 end fraction equals 64
rightwards double arrow straight R equals 8 percent sign
left parenthesis ii right parenthesis We space have space straight S. straight I. space for space 8 space years equals Rs. space 6400
rightwards double arrow fraction numerator straight P cross times 8 cross times 8 over denominator 100 end fraction equals 6400
rightwards double arrow straight P equals Rs. space 10 comma 000
left parenthesis iii right parenthesis space Difference space between space straight C. straight I. space and space straight S. straight I. space for space 2 space years equals Rs. space 1664 minus Rs. space 160 Rs. space 64

straight Q 2
left parenthesis straight i right parenthesis space Since space AMount space in space 4 space years equals Rs. space 92600 space and space amount space in space 5 space years equals Rs. space 97240.50
therefore 97240.50 minus 92600 equals Rs. space 4640.5 space is space the space interest space of space 1 space yr space on space Rs. space 92600
therefore Rate percent sign equals fraction numerator 4640.5 cross times 100 over denominator 92600 cross times end fraction equals 5 percent sign
left parenthesis ii right parenthesis space Amount space in space 6 space years
equals Amount space in space 5 space years plus space Interest space on space it space for space 1 space year
equals 97240.50 plus 5 percent sign space of space 97240.50
equals Rs. space 1 comma 02 comma 102
left parenthesis ii right parenthesis space Let space the space amount space in space 3 space years equals Rs. space straight x
rightwards double arrow Amount space in space 4 space years equals Amount space in space 3 space years plus space Interest space on space it space for space 1 space year
rightwards double arrow 92600 equals Rs. space straight x plus space 5 percent sign space of space straight x
Solving comma space straight x equals Rs. space 88 comma 190 end style

Answered by Rashmi Khot | 14th Apr, 2017, 11:26: PM

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