Please evaluate the solution of the following Problem

Problem- The Toy Company makes toys at two plants: Plant Alpha and Plant Beta. Plant Alpha must make a minimum of 1000 toy trucks and fire engines. Plants B must make a minimum 800 toy trucks and fire engines. Alpha can make 10 trucks and 5 engines per hour. Beta can make 5 trucks and 15 engines per hour. It costs $30/hr to produce trucks and $35/hr to produce engines.

Part 1- How many hours should be spent on producing toy trucks? fire engines? and the minimum cost to produce trucks and engines is?

I need help to compute the minimum cost to produce trucks and engines.