If 20% of a shipment of 50,000 tomatoes is crushed during transport and then 5% of the remaining tomatoes are lost to insects , then how many tomatoes remain

The answer is 33,500 because when u look for how many tomatoes were crushed it is 10,000 and the lost were 2,500 so when u add it its 12,500 then subtract  it from 50,000 the difference is 33,500