Question

I need help ASAP On number 2

Answer 1

No problem! 
Okay you must set and equation. 
$40 × ? = 10 
I used multiplication because when things are discounted, they are multiplied by decimals 
? = $\frac{10}{40}$
$\frac{10}{40}$ is equal to $\frac{1}{4}$

1/4 is 25%
The item needs to be marked down 25% to buy and get a discount of $10

Answer 2

Well basically you have to divide 10 into 40 and that would be 1/4 of 40 so you would need 25% to get the lamp at 10 dollars.