7th grade math help me please

Question

anonymous · Answer

Sam opened a money-market account that pays 4% simple interest. He started the account with $7,000 and made no further deposits. When he closed the account, he had earned $1,400 in interest. How long did he keep his account open?

    7 years
    5 years
    6 years
    8 years

anonymous · Answer

have can u copy this and put it in a reply so i can see it file:///Users/Kimberly/Pictures/Photo%20Booth%20Library/Pictures/Photo%20on%205-14-15%20at%202.13%20PM.jpg

tiff9702 · Answer

none of the above

anonymous · Answer

have can u copy this and put it in a reply so i can see it 

file:///Users/Kimberly/Pictures/Photo%20Booth%20Library/Pictures/Photo%20on%205-14-15%20at%202.13%20PM.jpg

tiff9702 · Answer

http://westlake.k12.oh.us/schools/lbms/earth/Lists/Calendar/Attachments/157/Percent%20review.pdf question 4 is the same one and the answer is c

tiff9702 · Answer

4 years

anonymous · Answer

i had to add one but i got the answer so thanks

tiff9702 · Answer

ok