Purchasing a building for $ 80 comma 000 by paying cash of $ 30 comma 000 and signing a note payable for $ 50 comma 000 will
a. increase both total assets and total liabilities by $ 80 comma 000.
b. increase both total assets and total liabilities by $ 50 comma 000.
c. decrease total assets and increase total liabilities by $ 30 comma 000.
d. decrease both total assets and total liabilities by $ 30 comma 000.

B. Increase both total assets and total liabilities by $50, 000

Explanation:

This can be best explained using accounting equation:

Asset = Liabilities + Equity

Purchasing a building means acquiring an asset which is an increase in asset, paying with cash is a decrease in asset  and issuing note payable is an increase in liability.

On the record of this transaction, the account equation will look like this:

Asset                                                      =    Liability                               +  Equity

Building ($80,000) - Cash ($30,000)  =         Note Payable ($50,000)

Increase                                                            Increase

So the equation set off to increase of $50,000 in total asset and total liabilities.