<span>Compound Interest is calculated on the initial payment and also on the interest of previous periods.
So after 1 year w/ 5% interest, $10 -> $10*1.05 = $10.5
after 2 year, the total becomes $10.5*1.05 = $11.025
formula to calculate is 10*(1.05)^50 = $114.67
ans is A</span>
Least common multiple question
Ronald: count by 6's
6, 12, 18, 24, 30, 36, 42, 48, 54 ....
Tim: count by 9's
9, 18, 27, 36, 45, 54,
every 18 days they do their laundry together
The sum of -3 and a number equal to -91 is -88
(-y + 5a - 4) + (3y - a - 5) is simplified to 2y + 4a - 11
