4. Sunscreen costs 4.80 HST is 13% Determine the price of the sunscreen, including HST. b) How much do you have to pay if you are using cash? Remember, we don't use pennies anymore. If you pay with a 10 bill, how much change will you get back?

## Step 1: Calculate the HST amount<br />### The HST is 13% of the price of the sunscreen. We calculate this by multiplying the price by the HST percentage: $ \$4.80 \times 0.13 = \$0.624 $.<br /><br />## Step 2: Calculate the total price<br />### To find the total price, we add the HST to the original price of the sunscreen: $ \$4.80 + \$0.624 = \$5.424 $.<br /><br />## Step 3: Round to the nearest nickel<br />### Since we don't use pennies anymore, we round the total price to the nearest nickel. $ \$5.424 $ rounds down to $ \$5.40 $.<br /><br />## Step 4: Calculate the change<br />### If we pay with a $ \$10 $ bill, the change will be $ \$10 - \$5.40 = \$4.60 $.