SOLUTION: A bill from Sam's Steakhouse was $18.40. We used a 20% discount coupon, but we also paid a 5% tax and 15% tip. We based the tip for the waitress on the full price of the dinner. Ho

Question 368332: A bill from Sam's Steakhouse was $18.40. We used a 20% discount coupon, but we also paid a 5% tax and 15% tip. We based the tip for the waitress on the full price of the dinner. How much was the actual cost of the dinner before discounts, tip, and tax?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi,

Let x represent the actual cost of the dinner.

Note: 20% off is the same as paying 80% of the actual cost

Am assuming here the coupon applied only to the cost of the meal.

Question states:

.80x + .05(.80x) + .15x = $18.40

.80x + .04x + .15x = 18.40

solve for x 

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