5. Natasha's preferences are represented by the utility function U(QA, QB) = QA + 20VQB, where QA stands for the number of apples and QB stands for the number of bananas. Her income is $M. An apple costs PA = $1 and a banana costs PB = $2. (a) What is her optimal affordable consumption bundle?(b) Express and draw her income-consumption curve, when income varies from $0 to $100.(c) Express and draw her Engel curve for apples, when income varies from $0 to $100.(d) Express and draw her Engel curve for bananas, when income varies from $0 to $100. M