Exercise 1 Page 155

We want to find the total bill with tip. Let's start by calculating the dollar amount of the tip. We can do this by using the percent equation. part = percent * whole We are given that the bill is $ 58, and the tip is 20 %. Let t represent the dollar amount of the tip. t = 20 % * $ 58Before 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 20 % is equal to 0.20 or 0.2. t = 20 % * $ 58 [0.3em] ⇓ [0.3em] t = 0.2 * $ 58 Finally, we will solve the equation for t. For simplicity, we will omit the dollar symbol.

We found that t= 11.6 is a solution to the equation. This means that the dollar amount of the tip is $ 11.60. Now we can calculate the total bill with tip. Total cost = $ 58 + $ 11.60 = $ 69.60 The total bill with tip is $ 69.60.