Tapo earns Tk.5.00 for every hour he works. Last week he worked for x hours. He purchased y kg of rice. Price of per kg rice ...

Tapo earns Tk.5.00 for every hour he works. Last week he worked for x hours. He purchased y kg of rice. Price of per kg rice is Tk.12.00. He saved the remaining amount. Which expression below ahows his savings?