Question

Kendra wants to purchase a bead necklace made of Jade. The cost depends on the amount of Jade in the necklace. Each bead is 7 mm in diameter and there are 100 beads in the necklace. What is the amount of Jade in the necklace in cubic centimeters?

Please can you help me with the formula and the steps in getting the answer? I really appreciate your time and help.