Answer:
His total income during the summer is $1200 ⇒ C
Explanation:
To round a number to a nearest given digit
- Look to the number right to this digit
- If the digit is 1, 2, 3, 4 keep the given digit as it and put all the digits right to it 0
- If the digit is 5, 6, 7, 8, 9 add the given digit by 1 and put all the digits right to it 0
Examples:
1. Round 1235 to the nearest hundred, the hundred digit is 2 and the digit right to it is 3, then keep the hundred digit 2 and put all the digit right to it 0, so the answer is 1200
2. Round 1265 to the nearest hundred, the hundred digit is 2 and the digit right to it is 6, then add the hundred digit 2 by 1 and put all the digit right to it 0, so the answer is 1300
Now let us solve the problem
∵ Jack earns $120 a week
- By rounding his weekly income to the nearest hundred dollars
∵ The hundred digit is 1
∵ The digit right to it is 2
- Keep the hundred digit 1 and put the digits right to it 0
∴ The rounded number is 100
∴ Jack earns $100 per week
- To estimate his total income during the 12 week summer
multiply 100 by 12
∴ His total income during the summer = 100 × 12
∴ His total income during the summer = $1200