Answer:
Total Cost 

Explanation:
Given:
Charges for an enlargement of 1 photograph = 

Delivery charge per order = 

Let number of enlargements of photograph in an order be 

We need to find the Total cost C of an order.
So the Total Cost would be equal to Charges for an enlargement of 1 photograph 
 number of enlargements of photograph in an order plus Delivery charge per order.
 number of enlargements of photograph in an order plus Delivery charge per order.
Total Cost per order 
