The price of beans at a supermarket is shown in the table. A table with two rows and four columns is shown. Row one is labeled pounds of green beans, p, and row two is labeled total cost, C. Eight tenths pound of green beans costs two dollars and forty cents. One and two tenths pounds of green beans cost three dollars and sixty cents. One and five tenths pounds of green beans cost four dollars and fifty cents. Six tenths pound of green beans costs one dollar and eighty cents.

Write an equation for the total cost C, in dollars, of p pounds of green beans.

Enter the correct answer in the box.