Final answer:
To calculate how much Roland paid in sales tax, we need to determine the discounted price by applying the discount rate to the original price. Then, we can find the sales tax by multiplying the discounted price by the tax rate and rounding to the nearest cent.
Step-by-step explanation:
To find out how much Roland paid in sales tax, we need to follow these steps:
- Calculate the discount he received by multiplying the original price by the discount rate: $42.99 x 0.40 = $17.2
- Subtract the discount from the original price to find the discounted price: $42.99 - $17.2 = $25.79
- Calculate the sales tax by multiplying the discounted price by the tax rate: $25.79 x 0.07 = $1.8053
- Rounding to the nearest cent, Roland paid approximately $1.81 in sales tax.