The total cost, C, is the sum of the cost to produce the centerpieces and the fixed cost. The equation for C is C = 8n + 500.
The total revenue, R, of Julio's floral business is the product of the cost per centerpiece and the number of centerpieces sold. The equation for R is R = 19.50n.
There is 1000 grams in a kilogram so he had a mass of 5,000 grames in his bag
64x2.40 = 153.6
64x1.90 = 121.6
add 153.6 to 121.6
275.2