At the beginning of January, treatment Susita had some money in her savings account.During each month she was able to deposit enough from her allowance to double the amount currently in the account.
But she had a loan to pay off, health requiring her to withdraw $10 from the account monthly.
She had to repeat this procedure each month.
At the end of May, she had $2 left in the account.
How much did Susita have at the beginning of January?