Core Mathematics

1A 50% increase followed by a 50% decrease returns to the original price.

2Compound interest is usually more than simple interest for the same P, R and T (T > 1).

3A car depreciates by 10% per year. After one year its value is

4If a price increases by 20% and then decreases by 20%, the final price is

5A machine costing GH₵ 2,500 depreciates by 10% each year. Find its value after 3 years.

6Simple interest on GH₵ 500 for 3 years is GH₵ 300. Find the rate.

7A machine costing GH₵ 1,200 depreciates by 15% each year. Find its value after 3 years.

8The principal is

9Depreciation increases the value of an asset.

10GH₵ 2,000 is invested at 20% compound interest per annum. The amount after 2 years is GH₵ ___.