1. Mary Joy gets a starting salary of 4,000 a month and an increase of P800 annually. What will be her salary during the fourth year?
2. Mang Joseph gave his son P500 on her 15th birthday, and instead increased by P200 each year. How much will the daugther receive on her 21th birthday?
3. A pile of logs has 30 logs in the first layer, 29 logs in the second layer, 28 logs in the third layer, and so on. How many logs are there in 10 layers?
