Question

if rupees 640 amount to rupees 985.60 in 3 year ,what will rupees 860 amount to in 2 years ,if the rate of interest is same in both cases

Answer 1

Intrest =p
$int = p \times r \times t \ \div 100 \\ intr = 945 .60 - 640 = 345.60 \\ so345.60 = (640 \times r \times 3) \div 100 \\ = 345.6 \times 100 = 1920r \\ r = 18 \\ now \: for \: amt \: 860 \\( p \times r \times t) \div 100 = (860 \times 18 \times 2) \div 100 = 309.60 \\ so \: amt = 860 + 309.60 = 1169.6$