Answer:
An income increase of will increase the monthly demand from 3200,000 to 3,520,000 cars per month.
Explanation:
An increase in income will increase the Q demanded by 10% at each price level. So the new quantity demanded is shown in the table below.
Price Qold Qnew
23000 600 660
21000 620 682
19000 640 704
17000 660 726
15000 680 748
So by summing both columns we find out that the old quantity demanded was 3,200,000 and the new quantity demanded is 3,520,000.
In the case of above example, the demand curve will simply shift upwards by 10%.