In which number is the digit 7 one-tenth as much than it is in the number 175,963? i need it quick

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

I'm confused on this could anyone me and show me what i need to do to solve it.