Ramon earns $1,665 each month and pays $53.10 on electricity. To the nearest tenth of a percent, what percent of Ramon's earnings are spent on electricity each month?

5500 dollars is placed in an account with an annual interest rate of 6.5%. to the nearest tenth of a year, how long will it take for the account value to reach 19700 dollars?

Florence price's brownies and more sells all types of cookies and pastries. on tuesdays, they markdown all brownies 75% to a sale of $1.50 a dozen. find the selling price and the markdown of a dozen brownies.

What is the lcm of 16 and 40 ? 24 and 40 ?