Violet has one-half of the money she needs to buy her mother a necklace. After her sister gives her \$30, she has three-quarters of the amount she needs. Violet’s father agrees to give her the rest. The amount that Violet’s father will give her is
Answer Choices
A. \$7.50
B. \$15
C. \$22.50
D. \$30
E. \$120