The Event Store sells invitations for various parties and special events. They charge a $35 setup charge, which includes your first 50 invitations. You will pay $0.75 for each invitation over the 50. The cost of invitations can be written as C = 35 + 0.75(g – 50) where g is the number of invitations you plan to buy.

The Special Occasion Store also sells invitations for various parties and special events. They charge a $45 setup charge, which includes your first 50 invitations. You will only pay $0.65 for each invitation over the 50. The cost of the invitations can be written as C = 45 + 0.65(g – 50) where g is the number of invitations you plan to buy.