The pie shop has 6 x 10 = 60 slices of custard pie. Therefore, the pie shop will earn $3 x 60 = $180 for the 60 slices of custard pie.
This justifies what answer for what question? Q & A:
A pie shop charges $3 per slice of custard pie. They cut each whole pie into 10 slices. If they make 6 whole custard pies, how much money will the pie shop earn?
180