Respuesta :
Calculating the marginal utility per dolor for doughnut which is marginal utility divided by unit price. So that will be 11 for first, 10 for second, 9 for third, 8 for fourth, 7 for fifth, 6 for sixth, 5 for seventh, 4 for eighth, 3 for ninth, 2 for tenth.
Now the same for coffee = 2.5 / $1 = 2.5.
Compare the MU per dollar of both goods to determine the amount of money he needs to buy the first cup of coffee.
So obviously the MU value will be higher for doughnut until he reaches his ninth that 3>2.5, for the tenth doughnut coffee MU is higher so he will buy 9 doughnuts for $1 and then buy his first coffee.
Total would be $9 on doughnut and $1 on coffee bringing it to 9 + 1 that is $10.
Now the same for coffee = 2.5 / $1 = 2.5.
Compare the MU per dollar of both goods to determine the amount of money he needs to buy the first cup of coffee.
So obviously the MU value will be higher for doughnut until he reaches his ninth that 3>2.5, for the tenth doughnut coffee MU is higher so he will buy 9 doughnuts for $1 and then buy his first coffee.
Total would be $9 on doughnut and $1 on coffee bringing it to 9 + 1 that is $10.