£79.2
Step-by-step explanation:
Brian's investment = £990
Percentage of simple interest received per year = 2%
Simple interest in 4 yeare will now be 2/100×990
[tex]0.02 \times 990 = 19.8[/tex]
Therefore in one year Brian earns £19.8
in 4 years Brian will earn 4years×£19.8 = £79.2