Chef should prepare 4 cakes and 5 batches of pastry in order to achieve maximum profits and his maximum profit or revenue by solving through inequality is $260.
Given Chef uses 5 cups of cake batter for 1 cake and 4 cups of batter for 1 batch of cupcakes. Chef wants to make at least 4 cakes. Profit on 1 cake is $35 and $30 for 1 batch of cupcake.
let the number of cakes be x and the number of batches of cupcakes be y such that
5x+4y<=40--------1
x>=4---------------2
Maximize Profit=35x+30y
Inequalities contains different signs so we have to change one inequality.
5x+4y<=40
-x<=-4
Now assume them equalities
5x+4y=40-------3
-x=-4
multiply second equations by 5
-5x=-20-----------4
now add 3 and 4
5x+4y-5x=40-20
4y=20
y=5
now put the value of y in 5x+4y=40
5x+4*5=40
5x+20=40
5x=20
x=4.
Maximum Profit=35x+30y
=35*4+30*5
=$260
Hence chef should make 4 cakes and 5 batches of pastry and maximum profit of $260.
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