Terry earns a $250 salary plus $5 per sale. How many sales must Terry make to earn $765 altogether?

To find out how many sales Terry must make to reach a total earning of $765, we start with the information provided about his earnings. Terry has a fixed salary of $250, and he earns an additional $5 for every sale he makes.

First, we can set up an equation to reflect his total earnings. Let's denote the number of sales Terry makes as ( s ). His total earnings can be expressed as:

[ \text{Total Earnings} = \text{Fixed Salary} + (\text{Commission per Sale} \times \text{Number of Sales}) ]

Substituting the numbers into the equation:

[ 765 = 250 + (5 \times s) ]

To isolate ( s ), the first step is to subtract the fixed salary from both sides of the equation:

[ 765 - 250 = 5s ] [ 515 = 5s ]

Next, we divide both sides by 5 to solve for ( s ):

[ s = \frac{515}{5} = 103 ]

Thus, Terry must make 103 sales in order to earn a total of $765. This calculation confirms that the answer is correct.