My question is: Since 1989, Lily has treated herself to 1 hydrangea plant, each year. Each plant costs $20.00. By 2021, how much money has Lily spent on hydrangeas? Your thoughts:
She started buying plants in 1989 and it's now 2021 so she has bought these plants for 2021 - 1989 = 32 years. Each plant costs $20.00 and she has bought them for 32 years so she has spent 20 * 32 = $640.00 on hydrangeas. The final answer: 640.