Spiral Review - Topics 1 - 3.3

Front

What is the formula to calculate the final price after a discount?

Back

Final Price = Original Price - (Original Price × Discount Rate)

Front

If an item costs $120 and has a 12% discount, what is the amount of the discount?

Back

Discount Amount = $120 × 0.12 = $14.40

Front

What is the final price of an item that costs $120 with a 12% discount?

Back

Final Price = $120 - $14.40 = $105.60

Front

What is the constant of proportionality?

Back

The constant of proportionality is the ratio between two proportional quantities, often represented as k in the equation y = kx.

Front

If a store sells 120 TVs in December and 25% more in January, how do you calculate the number of TVs sold in January?

Back

Number of TVs in January = 120 + (120 × 0.25) = 150

Front

What is the formula to calculate the total cost including tax?

Back

Total Cost = Price + (Price × Sales Tax Rate)

Front

If a skateboard costs $80 and has a 20% discount, what is the sale price?

Back

Sale Price = $80 - ($80 × 0.20) = $64

Front

What is the total cost of a skateboard that costs $80 with a 20% discount and 6% sales tax?

Back

Total Cost = $64 + ($64 × 0.06) = $67.84

Front

What is the result of the expression -2.3 + 35.6?

Back

The result is 33.3.

Front

How do you calculate a percentage increase?

Back

Percentage Increase = (New Value - Original Value) / Original Value × 100%.