exam Maths Puzzle Numerical Ability

Can someone please help me with this problem?

The price of a doll increased from $600 to $800. What was the percent of the increase? Round to the nearest tenth percent.

Thanks in advance for your help!

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exam Other Question

write an equation for the linear function f satisfying the given conditions
1. f(3)=4 and f(0)=9
2. f(2)=7 and f(8)=1 Mr. Paxton invested $2,000 more then his wife. the income from both investments at 5% was $250 in a year. How much did each invest?