Answer 9: Pay rise

An increase of £300 every six months.

Reasoning

The trick here is to work out what the actual take home pay would be every year. As the following table illustrates, the smart candidates get more money from choosing a six monthly pay rise.

Years	With £300 every 6 months	With £1000 every year	Difference
1	£5,000+£5,300=£10,300	£5,000+£5,000=£10,000	£300
2	£5,600+£5,900=£11,500	£5,500+£5,500=£11,000	£500
3	£6,200+£6,500=£12,700	£6,000+£6,000=£12,000	£700
4	£6,800+£7,100=£13,900	£6,500+£6,500=£13,000	£900
n	£1,200n+£9,100	£1,000n+£9,000	£200n+£100