When income levels of consumers increase, the demand for normal goods typically increases, resulting in a rightward shift of the demand curve for those goods. Conversely, the demand for inferior goods usually decreases when consumer income rises, which leads to a leftward shift in their demand curve.
In this case:
- The demand curve for cell phones, which is a normal good, would shift to the right.
- The demand curve for instant noodles, which is an inferior good, would shift to the left.
Therefore, the correct response is: "The demand curve for cell phones would shift to the right, and the demand curve for instant noodles would shift to the left."