At a certain rate of simple interest Rs. 800 amounted to Rs. 920 in 3 years. If the rate of interest be increased by `3%`. What will be the amount after 3 years ?

Explanation

Let the original rate of interest is `R%`.
`because 920 = 800 + (800xx 3xxR)/100`
`rArr 120 = (800xx 3xxR)/100`
`therefore R = (120 xx100)/ (800 xx3) = 5%`
At the rate of interest increased by `3%`.
New rate =` (5 + 3)% = 8%`
`therefore` Interest = `(800xx 8xx3)/100` = Rs. 192 `therefore` Amount = 800 + 192 = 992
`therefore` Hence, Required amount = Rs.992