Betty earns $100,000 working as a part time lawyer in New Orleans. The company provides a 1-to-1 matching contribution in the 401(k) plan up to a maximum contribution of 4% of compensation. Her 401(k) plan account had $50,000 in it at the beginning of the year. She contributed $15,500 to the plan this year and the employer made the matching contribution before year-end. The ending balance of the account is $87,000. What is her return on investments this year?

Group of answer choices

a)6.675%.

b)18.3%.

c)29.2%.

d)35%.