Answer:
The cost of 12kg of tea is $ 27.60
Step-by-step explanation:
Let m represent the mass of the tea
Let c represent its cost
The cost of tea varies directly with the mass is written as
c = km
where k is the constant of proportionality
when m = 4.5kg
c = $ 10.35
Substitute the values into the above formula
10.35 = 4.5k
Divide both sides by 4.5
k = 2.3
So the formula for the problem is
c = 2.3m
when the mass is 12kg
the cost is
c = 2.3 × 12
c = $ 27.60
Hope this helps you
