Question

20/0
ecrease; 21%
22. The price of milk was first increased by 10%
and then decreased by 20%. What is the net
percentage change in final price of milk?
(a) 12% (b) 15%
(c) 10% (d) 7.5%​

Answer 1

✰✰|| Given ||✰✰

• price of milk was first increased by 10%

• then decreased by 20%

✰✰|| To Find ||✰✰

• net percentage change in final price of milk

✪|| Solution ||✪

Let, the price of milk be ₹100

price of milk after increase = ₹100 + 10/100 × 100

⇒price of milk after increase = ₹100 + 10

⇒price of milk after increase = ₹110

Price of milk after decrease = ₹110 - 20/100 × 110

→ Price of milk after decrease = ₹110 - 20/100 × 110

→ Price of milk after decrease = ₹110 - 22

→ Price of milk after decrease = ₹88

Net, change% in final price = 100 - 88/100 × 100

↬ Net, change% in final price = 12/100 × 100

↬ Net, change% in final price = 12%

net percentage change in final price of milk = 12%