A 2 in. × 8 in. × 10 in. iron casting is produced and, after cooling to room temperature, is found...

A 2 in. Ă— 8 in. Ă— 10 in. iron casting is produced and, after cooling to room temperature, is found to weigh 43.9 lb. Determine

(a) the percent of shrinkage that must have occurred during solidification and

(b) the number of shrinkage pores in the casting if all of the shrinkage occurs as pores with a diameter of 0.05 in.