Is there supposed to be more of this question? Or is there supposed to be a graph?
Answer: The Cars Average Speed Will Be 60Mph.
You take 3.5% of £42,000 and add that to £42,000, so...
0.035 (aka 3.5%) x 42,000= 1,470+42,000= 43,470...
The manager now makes £43,470