Please help me answer these two questions please

15 points ! ~ see if you know the answer to both you!

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.