The learner understands taxes and tips as percentage increases applied to a stated base amount, such as a purchase subtotal or meal cost, and calculates the percentage amount, combined total, and possibly the original amount when the rate and final amount are known. They represent the relationships with decimal or fraction forms of percents and equations, round monetary results appropriately to cents, and distinguish the tax or tip from the total rather than treating a percent as a fixed dollar amount.
A tax or tip is a percentage of the original amount, not a fixed dollar amount.
To calculate it:
Example: A meal costs 36.807%18%$ tip based on the meal cost.
Find the tax:
Convert to a decimal:
Multiply:
The tax is 2.58}$ after rounding to the nearest cent.
Find the tip:
Convert to a decimal:
Multiply:
The tip is 6.62}$ after rounding to the nearest cent.
Find the final cost:
Add the meal cost, tax, and tip:
The final cost is 46.00}$2.58$6.62$; neither percentage is itself the total.
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