Assume a 31-day month to calculate your average daily balance for your credit card bill- Your daily balance for the first 10 days was $1,400, for the next 10 days was $1900, and for the last 10 days was $2700- What will your average daily balance be at the end of the month?

Wise ways to use a Credit card are:
Pay off your balance every month. 
Use the card for needs, not wants.
Never skip a payment. 
Use the credit card as a budgeting tool. 
Use a rewards card.
Stay under 30% of your total credit limit.