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Maharashtra Class 7 Answered

Javed deposited ,₹12,000 at 9 p.c.p.a in a bank for some years.At the e d of the period he received altogether ₹17,400.For how many years did he deposit his money?
Asked by abhishekpathak1509s | 26 Nov, 2018, 06:29: PM
answered-by-expert Expert Answer
Total Amount A = begin mathsize 12px style P open parentheses 1 plus r over 100 close parentheses to the power of n end style
where P is principle, r is rate of interest and n is period in years
begin mathsize 12px style 17400 space equals space 12000 open parentheses 1 plus 9 over 100 close parentheses to the power of n space equals space 12000 cross times open parentheses 1.09 close parentheses to the power of n
open parentheses 1.09 close parentheses to the power of n space equals space 174 over 120 equals space 1.45
n space space equals space fraction numerator ln open parentheses 1.45 close parentheses over denominator ln left parenthesis 1.09 end fraction space equals space 4.3 space y e a r s space equals space 4 space y e a r s space 4 space m o n t h s end style
Answered by Thiyagarajan K | 27 Nov, 2018, 05:53: AM
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