(i) Mr. Short's electricity bill for the quarter amounts to 467.50 The fixed charge is 47.50 and the price of electricity is 16.80 per unit. How many units has he used?

To find out how many units Mr. Short has used, we need to subtract the fixed charge from the total bill and then divide the result by the price per unit.<br /><br />Step 1: Subtract the fixed charge from the total bill.<br />$467.50 - 47.50 = 420$<br /><br />Step 2: Divide the result by the price per unit.<br />$420 ÷ 16.80 = 25$<br /><br />Therefore, Mr. Short has used 25 units of electricity.