
The total amount of joint cost is $32,800
Explanation:
Cost to be allocated ÷ Allocation base = Allocation rate
($40,000 + $44,000) ÷ (4,000 platters + 1,000 cups)
                = $16.80 per unit
Allocation rate x Weight of the base = amount to allocate
$16.80 x 4,000 units = $67,200 to platters
$16.80 x 1,000 units = $16,800 to cups
                              Platters     Cups
Sales                          $ 100,000   $12,000
Allocated joint cost               (67,200)    (16,800)
Further processing cost              0        (2,000)
Income                         $32,800    $(6,800)