How do I calculate what percentage something went up in price?

For example a stock price was 14.00 six months ago, and now is at 47.00. What percent did it go up? What about the reverse, to find how much a price went down? Thanks.How do I calculate what percentage something went up in price?
Take the resulting number(47) and divide it by the original number(14). This equals 3.357. Then multiply that answer by 100 to convert it into a percentage. The final answer is 335.7% of the original price. Or you can take that percent and subtract 100% to figure out how mich it increased by, 235.7%. This works for both increases and decreases like you asked.