Question

The ratio b/w a sum of money and amount at the end of T yrs is 4:5 and in next 3yrs the ratio becomes 5:7.What is the rate of interest PA and the Value of T.??​

Answer 1

Answer:

Step-by-step explanation:

P/(P+PRT/100) =4/5

5P=4(P+PRT/100)

=>5P=4P+PRT/25

=>5P-4P=PRT/25

=>1=RT/25

=>RT=25. ..... (1)

A/Q NEXT 3YRS

P/[P+PR(T+3)/100] =5/7

=7P=5P+PR(T+3)/20

=>2P=PR(T+3)/20

=>2=R(T+3)/20

=>40=RT+3R

=>40=25+3R. .... FROM EQ1

=>3R=40-25

=>R=15/3=5%