Asher's work coins

We've been struggling to get Asher to want to get his work done. We're tired of the crabbing about how much he hates chores and homework, and him having to get up early in the morning because he didn't finish his homework, etc. So here's the plan for the fake coins I made.
 

Conversion:

4 silver KJ's = 1 gold KJ

Earnings:

Chore = 1 gold KJ

Piano practicing = 1 gold KJ

Scripture reading = 1 gold KJ

Homework = 1 gold KJ

Reading = 1 gold KJ

Laundry = 1 silver KJ

Shower = 1 silver KJ

Pajamas = 1 silver KJ

Bathroom = 1 silver KJ

Brush teeth = 1 silver KJ

Costs:

Dinner = 4 gold KJs                 6:00-7:00

Peanut butter = 2 gold KJs       7:00-7:30

Dessert = 2 gold KJs

Candy = 2 gold KJs

After bedtime = 1 silver KJs

Note:

Sunday's Dinner and Dessert are free.