Isocost equation: We are to buy quantities of two items: n1 units of item 1 and n2 units of item 2. a. If item 1 costs $3.50 per unit and item 2 costs $2.80 per unit, find a formula that gives the...

Isocost equation: We are to buy quantities of two items: n1 units of item 1 and n2 units of item 2.

a. If item 1 costs $3.50 per unit and item 2 costs $2.80 per unit, find a formula that gives the total cost C, in dollars, of the purchase.

b. An isocost equation shows the relationship between the number of units of each of two items to be purchased when the total purchase price is predetermined. If the total purchase price is predetermined to be C = 162.40 dollars, find the isocost equation for items 1 and 2 from part a.

c. Solve for n1 the isocost equation you found in part b.

d. Using the equation from part c, determine how many units of item 1 are to be purchased if 18 units of item 2 are purchased.