Answer : The total commission she earn on the sale of these two vehicles will be, $4250
Explanation : Given,
She earns commission on each motorcycle = 10 %
She earns commission on each car = 15 %
Cost of motorcycle = $5,000
Cost of car = $25,000
Now we have to calculate the total commission that she will earn on the sale of these two vehicles.
Commission of each motorcycle =

and,
Commission of each car =

Total commission on both vehicles = Commission of each motorcycle + Commission of each car
Total commission on both vehicles = $500 + $3750
Total commission on both vehicles = $4250
Therefore, the total commission she earn on the sale of these two vehicles will be, $4250