If a toy costs 150 baht at the market, which amount is correct for buying two toys?

Sarah wants to buy a book priced at 250 baht. She has 500 baht. How much will she have left after buying it?

A shirt costs 400 baht and a pair of pants costs 600 baht. How much do they cost together?

Tom bought a game for 750 baht. If he gives the seller 1000 baht, how much change should he get?