Final answer:
The price of the hats to guarantee a revenue of $6625 from sales of the hats is $21.
Step-by-step explanation:
To guarantee a revenue of $6625, we need to find the price of the hats that will result in selling the most hats. We can start by calculating the number of hats sold at different prices:
- At $18, 300 hats are sold.
- At $19, 300 - (1 * 5) = 295 hats are sold.
- At $20, 300 - (2 * 5) = 290 hats are sold.
- At $21, 300 - (3 * 5) = 285 hats are sold.
- At $22, 300 - (4 * 5) = 280 hats are sold.
We can see that as the price increases by $1, the number of hats sold decreases by 5. Now, we can calculate the revenue at different prices:
- At $18, the revenue is 300 * 18 = $5400.
- At $19, the revenue is 295 * 19 = $5605.
- At $20, the revenue is 290 * 20 = $5800.
- At $21, the revenue is 285 * 21 = $5985.
- At $22, the revenue is 280 * 22 = $6160.
To guarantee a revenue of $6625, the price of the hats should be $21. Therefore, the correct answer is c) $21.