Answer:P840 for 10 T-shirtsStep-by-step explanation:Each T-shirt is P120.00/(T-shirt)a) 2 T-shirts would be 2*(P120.00/T-shirt) or P 240/2 T-shirtsb) The third T-shirt is free, so: P 240/3 T-shirts.c) 9 T-shirts would be 3*( P 240/3 T-shirts) = P720/9 T-shirtsd) Add one more T-shirt = P120/(T-shirt)e) Total for 10 T-shirts is (P720/9 T-shirts) + P120/(T-shirt) = P840/10 T-shirts)