Let's use an example number. In this case, we'll use... 5! You need to multiply the number of hours by how much you need to pay them and you need to add their fee. If David mows a lawn for 5 hours (5.50 × 5 + 15), then you'll have to pay him $42.50. If Ari mows a lawn for 5 hours (6.25 × 5 + 12), then you'll have to pay her $43.25.
Ari's charge is greater than Davids charge!
} I hope this helped! {