How to flip a desk 5 feet long and then flip another desk and it was 10 feet long what would be the answer

Ineed ! what is the connection between ratios, fractions, and percents? give an example with your answer.

The population in a city is modeled by the equation p(d)= 100,000*(1+0.3) where d is the number of decades since 1970

Me because i don't understand how to do it.: )