Pina's World Toy Shop is an on-line toy store specializing in hand-made stuffed animals. Pina's World sold 4000 Donny the Dragon stuffed toys during April and 6000 during May. Shipping costs for the two months were $13800 and $18200 respectively. Using these two months' data, the shipping cost function is best estimated as ($2.20% number of toys sold) + $5000, ($3.45 x number of toys sold) + $3200, O ($2.30 x number of toys sold) + $80800. O ($0.50 x number of toys sold) + $11800