Solving Proportions, Percent of Change, Tax and Discount

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you calculate the total cost including a tip?

Back

To calculate the total cost including a tip, multiply the original cost by the tip percentage (as a decimal) and add it to the original cost.

Front

What is the formula for calculating percent of change?

Back

Percent of change = (New Value - Original Value) / Original Value x 100%.

Front

How do you calculate a discount on an item?

Back

To calculate a discount, multiply the original price by the discount percentage (as a decimal) and subtract that amount from the original price.

Front

What is the total cost of a meal that costs $8.00 with a 6% tip?

Back

Total cost = $8.00 + ($8.00 x 0.06) = $8.48.

Front

If a computer costs $385 and has a 30% discount, how much do you save?

Back

Savings = $385 x 0.30 = $115.50.

Front

What is the solution to the equation 2x + 3 = 5?

Back

x = 1.

Front

What is the solution to the equation 3x - 5 = 10?

Back

x = 5.

Front

What is the solution to the equation x/2 = 2?

Back

x = 4.

Front

What is the solution to the equation 4x = 60?

Back

x = 15.