Answer:
$10.10
Explanation:
Consumer surplus is the difference between the willingness to pay of a consumer and the price of the product.
Consumer surplus = willingness to pay of a consumer - price of the good
Producer surplus is the difference between the price of the product and the least price the producer is willing to sell his product
Producer surplus = price of the product - least price the producer is willing to sell his product
Consumer surplus
Jeff : $7.25 - $5 = $2.25
Samir: $9 - $5 = $4
Total consumer surplus = $2.25 + $4 = $6.25
Producer surplus
Ist manufacturer = $5 - $3 = $2
2nd manufacturer = $5 - $3.15 = $1.85
Total producer surplus = $2 + $1.85 = $3.85
Total social welfare = $3.85 + $6.25 = $10.10
I hope my answer helps you