A sum of money, \(\$\) \( P \), invested in a bank was found to become 4 times its value in every 4 years. If the value of the sum of money after \( t \) years is given by \( P(1+r)^t \), what is the value of \( r \)?
Ten friends wish to raise funds for a get-together. Six of them contributed \(\$ 60\) each while each of the other four friends contributed \(\$ 60\) more than the average contribution of all ten friends. What was the total contribution of the ten friends?
Which of the following is true? \[ \text{Quantity A: } x, \text{ where } x \text{ is 65\% of 408.} \] \[ \text{Quantity B: } y, \text{ where } y \text{ is 40\% of 663.} \]