You have been asked to help your managing director, Mr. Green, to plan the transport for his daughter's forthcoming wedding. He has already decided to hire Silver Shadow andor Princess cars; a Silver Shadow costs $200 to hire and a Princess costs $150. He wants to hire a total of 10 cars and spend no more than $1800. How many of each type of car should he hire?
a) 6 Silver Shadow, 4 Princess
b) 5 Silver Shadow, 5 Princess
c) 4 Silver Shadow, 6 Princess
d) 3 Silver Shadow, 7 Princess