Peg spends $7.50 a week for grapefruit. When grapefruit are out of season, she gets 1 fewer grapefruit than when they are in season. If the price decreases by $3 per dozen in season, how many dollars will it cost to buy a dozen grapefruit out of season?

More information needed. How many grapefruit is she getting for the $7.50?

To find out how many dollars it will cost to buy a dozen grapefruit out of season, we first need to determine the price of a dozen grapefruit in season.

We know that Peg spends $7.50 a week for grapefruit. Let's assume that she buys a dozen grapefruit when they are in season. If the price decreases by $3 per dozen in season, the cost of a dozen grapefruit in season would be $7.50 - $3 = $4.50.

Now that we know the cost of a dozen grapefruit in season, we can determine the cost of buying a dozen grapefruit out of season. We were given the information that when grapefruits are out of season, Peg gets 1 fewer grapefruit than when they are in season. So, if she buys a dozen grapefruit out of season, she would be getting 12 - 1 = 11 grapefruit.

Since the cost of a dozen grapefruit in season is $4.50, we can calculate the cost of buying a dozen grapefruit out of season using a simple proportion:

(12 grapefruit) / ($4.50) = (11 grapefruit) / (x dollars)

Cross multiplying, we get:
12 * x = 11 * $4.50
12x = $49.50
x = $49.50 / 12
x ≈ $4.13

Therefore, it will cost approximately $4.13 to buy a dozen grapefruit out of season.