Start by calculating the dollar amount of the tip by using the percent equation.
$ 44.85
Practice makes perfect
We want to find the total cost of ordering a pizza. 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 ordering a pizza $ 39 plus 15 % tip. Let t represent the dollar amount of the tip.
t = 15 % * $ 39Before 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 15 % is equal to 0.15.
t = 15 % * $ 39 [0.3em] ⇓ [0.3em]
t = 0.15 * $ 39
Finally, we will solve the equation for t. For simplicity, we will omit the dollar symbol.
We found that t= 5.85 is a solution to the equation. This means that the dollar amount of the tip is $ 5.85. Now we can calculate the total cost of ordering a pizza, which is the regular cost of a pizza plus the tip.
Total cost = $ 39 + $ 5.85 = $ 44.85
The total cost of ordering a pizza is $ 44.85.
