Columbia paper has following stockholders's equity account .the firm's common stock has has current market price of $30 per share
Preferred stock $100000
c,s (10000shares at 2 par) 20000
Paid in capital in excess of par 280000
Retained earnings 100000
Total stockholders equity $500000
a... show da effect on columbia of 5% of stock dividend
b... show da effect of 10and 20% stock dividend
c.discuss da effect of stock dividend on stockholders equity

I can not understand this question please solve this question

We do not "solve" homework here. Homework was meant for the student to solve.

Principles of Accounting Chapter 14 (http://www.principlesofaccounting.com/chapter%2014.htm#DIVIDENDS%20AND%20SPLITS)

Scroll down to the stock dividend portion. At least make some attempt to do the homework and you can post those attempts.