Calculate $($A$)$ the average daily balance and $($B$)$ the finance charge, if finance charge is $1\%$ on the average daily balance.

$30$ Day Billing Cycle

$4/20$

Prev Balance

$$800$

$4/27$

Payment

$$100$

$4/30$

Charge

$$300$

$5/9$

Payment

$$50$

$5/12$

Cash Adv

$$200$