Use reasoning to lead to the answer of the following question:
Kirsty collects small models of animals. The last time she bought some, each one cost $0.45. She saves enough to buy 30 models, but when she goes to the shop, she finds out that the price had increased to $0.50. How many models can she buy now?

27
Kirsty has 0.

45 × 30 = $13.

50 to spare to buy her models.

She can only buy 13.

50 ÷ 0.

50 = 27 models as the price of each individual model has increased.

.

So, the answer is 27