I need help on this question please help?

If 20% of a number is 35, what is 50% of that number?

Me with this one question, and i'll upvote the brainliest answer

The marriott family bought a new apartment three years ago for $65,000. the apartment is now worth $86,515. assuming a steady rate of growth, what was the yearly rate of appreciation? what is the percent of the yearly rate of appreciation?