Which situation represents a proportional relationship? The cost of purchasing a case of lemons for $1.75 per pound plus $2.25 for the crate. The cost of purchasing a case of lemons for $1.75 per pound plus $2.25 for the crate. The cost of purchasing apples for $5.00 per box with a delivery charge of $7.00. The cost of purchasing apples for $5.00 per box with a delivery charge of $7.00. The cost of purchasing eggs for $3.40 per dozen with a coupon for $2.50 off the total cost. The cost of purchasing eggs for $3.40 per dozen with a coupon for $2.50 off the total cost. The cost of purchasing pork chops for $4.25 per pound plus a shipping fee of $0.50 per pound.