Question

The price of commodity A increases by 40 paise every year, while the price of commodity B increase by 15 paise every year. If in 2004, the price of commodity A was 4.20 and that of B was 8.30, in which year commodity A will cost 40 paise more than commodity B?

Answer 1

Answer:

After 2001 i.e  2011

Step-by-step explanation:

Solution

Suppose commodity X will cost 40 paise more than Y after z years

Then,(4.20 + 0.40z) − (6.30 + 0.15z) = 0.40

⇒ 0.25z = 0.40 + 2.10

⇒z=2.50/0.25=250/25=10

∴ X will cost 40 paise more than Y 10 years