in a public show 50 % of the seats were filled . if there were 600 seats in the hall , how many seats were vacant ?
"50 % of 600 = 50 / 100 × 600 = 300 therefore , the number of vacant seats = 600 - 300 = 300 . answer : d"
divide(multiply(600, subtract(const_100, 50)), const_100)