The amount of money in an account with continuously compounded interest is given by the formula A = pert, where P is the principal, r is the annual interest rate, and t is the time in years.
Calculate to the nearest tenth of a year how long it takes for an amount of money to double if interest is compounded continuously at 5.2%.

To keep cylindrical tanks from tipping over, a designer is planning to enlarge the original area of the base by 50%. the new tank should have the same volume as the original. how should the designer change the height of the tank? a: make it 50% taller than the height of the original tank. b: make it 6623% taller than the height of the original tank c: make it 3313% shorter than the height of the original tank d: make it 50% shorter than the height of the original tank.