###Human: An archer needs to practice.  He intends to shoot 200 shots 4 days a week.  He is able to recover 20% of his arrows.  The arrows he uses cost $5.5 per arrow.  His team agrees to pay for 70% of the cost of his arrows.  How much does he spend for arrows a week?, ### Assistant: He shoots 200*4=800 shots per week
He can recover 800*.2=160 of those arrows
So he uses 800-160=640 arrows a week
The cost for those arrows would come out to 640*5.5=$3520 per week
His team pays for 3520*.7=$2464 of that
So he has to pay 3520-2464=$1056 per week for arrows 
 So the answer is :  1056