Question

Dinner at your grandfather's favorite restaurant now costs $25.25 and has been increasing steadily at 4% per year. How much did it cost 35 years ago when he was courting your grandmother?

Answer 1

This will be a little complex number...
assume 35 years ago, it cost x dollars
for now:      x×$1.04^{35}$=25.25
solve it! :) maybe too difficult without a calculator