A consumer spends all of her weekly budget of
$18
on two goods, X and Y. Good X costs
$2
per unit and good Y costs
$3
per unit. Her marginal utility schedules are shown below.
| Units consumed |
Marginal utility of X (utils) |
Marginal utility of Y (utils) |
| 1 |
20 |
36 |
| 2 |
16 |
30 |
| 3 |
12 |
24 |
| 4 |
10 |
18 |
| 5 |
8 |
15 |
| 6 |
6 |
9 |
Which combination of X and Y maximises her total utility?
Select one option.