Please help, I want to undersatand how to get this awnser.
A group of friends eat at Jae's cafe. They have an online coupon. The costs of their main courses, before applying the coupon, are $13.99, $16.99, $19.99, and $21.99. The total cost of their drinks is $12.00. What will their bill be before tax and tip?
(Calculate the discounted price for each meal, if the discount applies. Then find the sum of the resulting prices, the prices of any meals that were not discounted, and the cost of the drinks. Remember that to calculate the discounted price, multiply the original price by the discount, and then subtract the result from the original price.)