Becky's Bakery sells three large muffins for every two small ones. A large muffin sells for $8 with a variable cost of $4. A small muffin sells for $4 with a variable cost of $2.50. What is the weighted-average contribution margin? (Round any intermediate calculations and your final answer to the nearest cent.) $3 per muffin $2.75 per muffin $4 per muffin $1.5 per muffin