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 = 70x -x , 5xs 35. Approximately what increase in sales will result by increasing the advertising budget from $5,000 to $6,000? From $10,000 to $11,000? Find the differential dN dN = ( dx The increase in sales from increasing the advertising budget from $5,000 to $6,000 is approximately units. (Type a whole number) The increase in sales from increasing the advertising budget from $10,000 to $11,000 is approximately units. (Type a whole number) C