Question

if the price of pen decreases by 20% then a man can buy 10 more pens for 100₹, what is the new price of each pen?​

Answer 1

Let the price of the pen = Rs x

Pens that can be purchased for Rs 100 = 100/x

The new price of the pen = x × 80/100 = 4x/5

Pens that can be purchased for Rs 100 with reducted cost = 100x5/4x = 125/x

According to question,

125/x - 100/x = 10

25/x = 10 = x = 2.5

The new price of the pen = 4/5 × 2.5 = Rs = 2