What sum of money will amount to 520 in 5 years and to 589 in 7 years at simple interest(कौन सी धनराशि बियाज से 5 वर्षो में 520 और 7 वर्षो में 568 हो जाएगी)

Options

A. 4
B. 120
C. 510
D. 220

Explanation

(a)
Hence interest in 2years=48
Interest in 1years=(48)/(2)=24`
Interest in 5 years=`24xx5` =120
We know SI=Amount -Principal
Principal=(520-120)=400