Novak's World Toy Shop is an on-line toy store specializing in hand-made stuffed animals. Novak's World sold 4000 Donny the Dragon stuffed toys during April and 6000 during May. Shipping costs for the two months were $13200 and $18000 respectively Using these two months' data, the shipping cost function is best estimated as ($2.40 x number of toys sold) + $3600. O ($0.50 x number of toys sold) + $11200. O($3,30 % number of toys sold) - $3120. ($2.20 x number of toys sold) + $77200