1. On the Richter scale, earthquake  is estimated to be 3 and earthquake B is estimated to be
1.5. How stronger is Earthquake A compare to Earthquake B, estimate its difference.
2. At what simple interest rate per annum will P1 become P2 in 2 years.
3. How much would you invest at the simple interest is 7.5% in order to have P300,000 in 2
years.
4. How long will 1 million pesos earn a simple interest at 100,000 at 1% per annum​