Use differential approximations in the following problem.

A company will sell N units of a product after spending $x thousand in advertising, as given by N=70xx², 5x35. Approximately what increase in sales will result by increasing the advertising budget from $10,000 to $11,000? From $25,000 to $26,000?

Find the differential dN.

dN= ? dx

The increase in sales from increasing the advertising budget from $10,000 to $11,000 is approximately ? units.

(Type a whole number.)

The increase in sales from increasing the advertising budget from $25,000 to $26,000 is approximately ? units

(Type a whole number.)