An individual spends $$10$ per day. Suppose that this person pays for all her purchases using her credit card. She withdraws no money from her bank account until the morning of the fourth day, when she withdraws the whole amount necessary to pay for her credit card purchases over the previous four days.

Calculate the amount of money this person withdraws each time she goes to the bank.

She will withdraw $($Enter your response as a whole number.$)$

Compute this person's money holdings at the beginning of each of the next four days.

For day $1,$ money holdings are $ $($Enter your response as a whole number.$)$

For day $2,$ money holdings are $ $($Enter your response as a whole number.$)$

For day $3,$ money holdings are $ $($Enter your response as a whole number.$)$

For day $4,$ money holdings are $ $($Money holdings are at the beginning of the day before she makes any payments.$)$

Calculate the amount of money this person holds, on average.

Her average money holding is $ $q,($Enter your response as a whole number.$)$