A debtor reached an agreement with his creditor to repay a loan by making a monthly payment which is double of the amount she paid the previous month. If the debtors first payment was $200, and he is expected to pay back 51200, how many months will it take to fully repay the loan?	Select.
A) 9	B) 10	C) 9	D) 12	E) 10
First payment--$200   Total amount to be repaid--$25600   First month payment--$200   Second month payment( double the previous month payment)--$200*2=$400   Third month payment( double the previous month payment)--$400*2=$800   Fourth month payment( double the previous month payment)--$800*2=$1600   Fifth month payment( double the previous month payment)--$1600*2=$3200   Sixth month payment( double the previous month payment)--$3200*2=$6400   Seventh month payment( double the previous month payment)--$6400*2=$12800   Eight month payment( double the previous month payment)--$12800*2=$25600   Ninth month payment( double the previous month payment)--$25600*2=$51200   9nswer is 9
<result>A</result>
A debtor reached an agreement with his creditor to repay a loan by making a monthly payment which is double of the amount she paid the previous month. If the debtors first payment was $200, and he is expected to pay back 51200, how many months will it take to fully repay the loan?