Question

the interest for 3 years on Rs2400is Rs576 find the interest on Rs 4200 for 2 yrs at the same rate of interest​

Answer 1

Solution given:

time [t]=3years

principal [p]=Rs2400

rate[r]=?

simple interest [S.I]=Rs 576

we have

S.I=ptr/100

576=2400*3*r/100

576=72r

r=576/72

r=8%

now

principal [p]=Rs 4200

time[t]=2years

rate[r]=8%

simple interest [S.I]=?

we have

S.I= ptr/100=4200*2*8/100=Rs 672

The required interest is Rs 672.