Mass after 2nd year: 350 * 0.70 = 245 grams
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- #### 9,600
- A radioactive substance decays by 30% each year. If the initial mass is 500 grams, what is the remaining mass after 2 years?
- Mass after 1st year: 500 * 0.70 = 350 grams
- #### 245 grams
- A stock increases by 25% in the first quarter, decreases by 15% in the second quarter, and increases by 10% in the third quarter. If the initial stock price is $80, what is the stock price at the end of the third quarter?
- Price after 1st quarter: $80 * 1.25 = $100
