a car rental company uses the following table to help compute rental fees . Chevrolet $50.00 , corvette 85.00 , Pontiac 53.00 , Buick 60.00 , Oldsmobile 60.00 , Cadillac 70.00 (Rate per Day) . Rate per Mile .27 , .45 , .32 , .32 , .35 , .40 . It have to be in a C++ language

Store three arrays:

String[] model={"Chevrolet",....};
double[] dailyRate={50,85,53,60,60,70};
double[] milageRate={0.27, 0.45,....0.40};
int nModel=0;
int milage=0;
double cost;

then present a menu for user to choose from, remembering that model[0]="Chevrlet" because C++ arrays are numbered starting from zero.
The model number should be stored in nModel.
Input milage and do calculation of cost using
cost=dailyRate[nModel]+milage*milageRate[nModel];

Output the calculated cost.