Question

For each other, the web site applies a 7.7% sales tax to the price of the cards, plus a one-time mailing fee of $5.95. Based on the information in the table, what will be the total cost for an order for 280?

Answer 1

I'm assuming you want an equation since the price of the cards is not given. 
For the number of cards, I'll use X. The cost of the cards is c.

(280*c)*0.077+5.95