Exercise 3 Page 155

We want to find the total cost of the computer. Let's start by calculating the dollar amount of the tax. We can do this by using the percent equation. part = percent * whole We are given that the computer costs $ 1500 plus 7 % tax. Let t represent the dollar amount of the tax. t = 7 % * $ 1500Before 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 7 % is equal to 0.07. t = 7 % * $ 1500 [0.3em] ⇓ [0.3em] t = 0.07 * $ 1500 Finally, we will solve the equation for t. For simplicity, we will omit the dollar symbol.

We found that t= 105 is a solution to the equation. This means that the dollar amount of the tax is $ 105. Now we can calculate the total cost of the computer, which is the regular price of the computer plus the tax. Total cost = $ 1500 + $ 105 = $ 1605 The total cost of the computer is $ 1605.