Answer:
The producer surplus will be $17.
The consumer surplus will be $14.
Explanation:
The producer surplus is the difference between the minimum price a producer is willing to accept and the price he actually gets.
The consumer surplus is the difference between the maximum price a consumer is willing to pay for a product and the price it actually gets.
The price for mowing lawns is $21.
Producer surplus
= ($21 - $10) + ($21 - $15) + ($21 - $21)
= $11 + $6 + $0
= $17
Consumer surplus
= ($30 - $21) + ($26 - $21) + ($21 - $21)
= $9 + $5 + $0
= $14