In what time will a sum of money lent at 25 upon 3 percent simple interest become 4 times of - Maths - Direct and Inverse Variations

Question

In what time will a sum of money lent at 25 upon 3 percent simple
interest become 4 times of itself

Shruti Tyagi · Accepted Answer

Dear Student,

Formula for simple interestSI=PRT100also for amount=P+SIAs per the questionR=253P=x  initial sum investedA=4x   amount is 4 times of sum invetsedHence putting values we get4x=x+x×253×t100⇒3x=x×253×t100⇒3=25×t100×3⇒t=3×100×325t=9×4t=36 years
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In what time will a sum of money lent at 25 upon 3 percent simple interest become 4 times of itself