Question

if a principle P becomes Q in 2 years when interest is R%

Answer 1

$if \: it \: is \: simple \: interest \: then \\ interst = q - (p \times r \times t) \div 100 \\ t = 2 \\ interest = q - (p \times r) \div 50\\ and \: when \: it \: is \: compound \: \\ interest \: then \\ interest = q - p \times (1 + r \div 100) \: and \: his \: power \: of \: time \\ t = 2 \\ then \\ c.i. = q - p \times (1 + r \div 100)and \: power \: 2$