Question
PSLE
A puncher costs $1 more than a correction tape. The total cost of 7 such punchers is $3k.
  1. Express the cost of 21 such punchers in terms of k.
  2. Express the cost of the correction tape in terms of k.
2 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

PSLE
A puncher costs $1 more than a correction tape. The total cost of 7 such punchers is $3k.
  1. Express the cost of 21 such punchers in terms of k.
  2. Express the cost of the correction tape in terms of k.