Isabella Thrives on Two Goods: Lemons and Tangerines

Multiple Choice

Isabella thrives on two goods: lemons and tangerines.The cost of lemons is 40 guineas each and the cost of tangerines is 20 guineas each.If her income is 320 guineas, how many lemons can she buy if she spends all of her income on lemons?

A) 6
B) 8
C) 16
D) 11
E) None of the above.