Product Design A candy company makes a washer-shaped candy (a candy with a hole in it); se...

Product Design A candy company makes a washer-shaped candy (a candy with a hole in it); see Figure 1. Because of increasing costs, the company will cut the volume of candy in each piece by 22%. To do this, the firm will keep the same thickness and outer radius but will make the inner radius larger. At present the thickness is 2.1 millimeters (mm), the inner radius is 2 mm, and the outer radius is 7.1 mm. Find the inner radius of the new-style candy. [Hint: The volume V of a solid disc is πr2h, where r is the radius and h is the thickness of the disc.]

FIGURE 1

Washer-shaped candy.