If 12 is 10% of a value, what is that value

Naomi’s parents want to have 50,000, saved for her college education, if they invest 20000 today and earn 7% interest compound annually, about how long will it take them to save 50 thousand

Why is it so easy to buy on impulse and overspend with a credit card? what could you do to counteract this tendency?

If each bricks costs and he can only buy one brick how much will it cost him to get the material to put around the outside of his garden?