Can you me with number six and seven i don't get it and i need to be explained in word for word you if you can

6.
original=100%
75% off means
100%-75%=25%
remaining is 25%
it was sold for 45
therfor
25%=45
find 100%
just multipl it by 4 since 25 times 4=100
100%=45 times 4=180
originl price=180
answer is A

7. simle interest
I=PRT
P=principal=1000
I=interest=300
T=time=5
R=rate in percent form=?

300=1000*?*5
300=5000?
divide both sides by 5000
0.06=?
aka
6%

answer is 6%

b is answer

6. A
7. B

No he does not because he can only cover 12 square feet from 15 square feet which he will still need 3 more. this is because if 3×5=15 square feet and 15-12=3 which thats the answer