In an office in Singapore there are 60% female employees. 50 % of all the male employees are computer literate. If there are total 62% employees computer literate out of total 1600 employees, then the no. of female employees who are computer literate ?

Answer: Option C

Total employees = 1600
Female employees, 60% of 1600
$$=\frac{60\times 1600}{100}=960$$
Then male employees = 640
50% of male are computer literate,
= 320 male computer literate
62% of total employees are computer literate,
$$=\frac{62\times 1600}{100}=992$$     computer literate
Thus, Female computer literate = 992 - 320 = 672

Alternatively :
Let 60% employees are female and 40% are male
Then, 20% of male are computer literate and 42% are female computer literate
Female computer literate $$=\frac{1600\times 42}{100}=672$$