The price of pulses is reduced by 20%. Due to this reduction, a customer buys 5 kg more pulses for Tk. 500. Find the original price per kg of pulses.

Question: The price of pulses is reduced by 20%. Due to this reduction, a customer buys 5 kg more pulses for Tk. 500. Find the original price per kg of pulses.Solution:Let Original price of pulses = x Tk/kg.Original quantity = 500/x​ kgNew price = 0.80x Tk/kgNew quantity = 500/0.80x = 500/(4x/5) = (500 × 5)/4x = 625/x​ kgATQ,625/x - 500/x = 5⇒ (625 - 500)/x = 5⇒ 125/x = 5⇒ x = 125/5∴ x = 25Original price of pulses = 25 Tk/kg.