Answer:
The cost is $4.5
Explanation:
Since the price is projected to increase by 150%,
Since a hundred percent increase means the price gets doubled,
and a 50% increase means multiplication of the price by 1.5
so for 150% we multiply the price by 2.5
so that it will go up by 2.5 times
so 1.80(2.5) = $4.5