Empty calories budget free swing set and play fort to be built for the children’s church is $900 if the cost of the swingset should be at least 1/4 as much as the fort how much can be spent on the fort and still build the swing set

Harry owes the bank money. to repay his debt, he paid $150 back to the bank each month. after 10 months, his remaining debt was $6900. what was the original amount of harry's debt? how long did it take harry to pay back his entire debt?