22. l = 12m
b = 10m
Perimeter = 2(l + b)
= 2(12 + 10)
= 24 + 20
= 44m
Area = l×b
= 12 × 10
= 120m²
(a) Fencing required = 44m
Cost per metre = $12
Cost for the fencing of 44m = 12 × 44
= $528
(b) Levelling required = 120m²
Cost per metre² = $50
Cost for the levelling of 120m² = 120 × 50
= $6000
