A sum doubles in 8 years at simple interest. In how many years will the sum become 4 times the original sum?
16
24
64
40
32
let the sum is P then P becomes 2P in 8 years
p >> 8 years >>>2p>>>8 year >>>3p >>>8 years >> 4p
8+8+8 = 24 years
Because it is always equal In all years