Answer: $6.30
Explanation:
Given The cost of one pound of beans = $1.80
The quantity of green beans bought by Mrs.Tennison = 3 and 1/2 pounds
Thus, the quantity of green beans bought by Mrs.Tennison =

Now, the cost of quantity of green beans bought by Mrs.Tennison =

∴ The cost of quantity of green beans bought by Mrs.Tennison = $6.30