Exercise 2 Page 155

We want to find the total cost of the dinner. Let's start by calculating the dollar amount of the gratuity. We can do this by using the percent equation. part = percent * whole We are given that the dinner costs $ 43 plus 18 % gratuity. Let g represent the dollar amount of the gratuity. g = 18 % * $ 43Before solving the equation we got, we need to write the percent as a decimal. We can do this by ignoring the percent symbol and moving the decimal point two places to the left.

We got that 18 % is equal to 0.18. g = 18 % * $ 43 [0.3em] ⇓ [0.3em] g = 0.18 * $ 43 Finally, we will solve the equation for g. For simplicity, we will omit the dollar symbol.

We found that g= 7.74 is a solution to the equation. This means that the dollar amount of the gratuity is $ 7.74. Now we can calculate the total cost of the dinner, which is the regular cost of the dinner plus the gratuity. Total cost = $ 43 + $ 7.74 = $ 50.74 The total cost of the dinner is $ 50.74.