Question

17.
कोई धनराशि साधारण ब्याज की दर से 4 वर्ष में
बढ़कर 758 व 6 वर्ष में बढ़कर ३ 875 हो जाती
हैं धनराशि ज्ञात कीजिए-​

Answer 1

Let the principle be X Rs rate be y% per anum.

Therefore, Interest in 4 years = x * y*4/100

=4xy/100

Amount in 4 years =X + 4xy/100

Interest in 6 years = x *y*6/100

=6xy/100

Amount in 6 years = x + 6xy/100

Now we can say,

6xy/100 -4xy/100 = 875- 758

:. 2xy/100 =117

:. Xy=117*50

:. xy =5850

Now,

Interest in 4 years =5850*4/100

=234

Since, Amount in 4 years was 758

:. Principle = 758-234

= 524 Rs.