16 From her part-time job, Monika can earn a regular
amount of $120 per week. On average, she finds that
she uses 3/8 of her earnings on shopping, 2/5 on iTunes, 1/10 goes towards her mobile phone account and she
saves the rest.

a. What fraction of Monika's earnings can she save?

b. On average, how much of Monika's weekly
earnings goes towards each of the listed
categories?

c. Write a ratio for the average amount Monika
contributes weekly to shopping, iTunes, mobile
phone account and saving.