the present worth of rs . 2310 due years hence , the rate of interest being 15 % per annum , is :
"explanation : p . w . = rs . [ 100 × 2310 / 100 + ( 15 × 52 ) ] = rs . 1680 . answer : c"
add(divide(divide(2310, const_2), divide(add(const_100, 15), const_100)), divide(divide(2310, const_2), divide(add(const_100, divide(15, const_2)), const_100)))