A store has 240 pens in stock. They sell 120 pens in the first week and then receive a new shipment of 150 pens. How many pens does the store have in stock after these transactions?
Correct: C
Initially, the store has 240 pens. After selling 120 pens, they have 240 - 120 = 120 pens. Then, after receiving 150 more pens, they have 120 + 150 = 270 pens.