Answer: a) $1.20 and b) $4.40.
Explanation:
Since we have given that
Cost of 1 pound of cashew = $2
Cost of one pound of peanuts is 60% of the cost of one pound of cashews.
So, cost of 1 pound of peanuts is given by

And the total cost of 2 pounds of peanuts and one pound of cashews would be

Hence, a) $1.20 and b) $4.40.