The total amount Charles will charge to baby-sit 4 children for 4 hours is; $26
Since, Charles charges $4 an hour to baby-sit.
Therefore, when Charles is asked to baby-sit for four hours;
His normal charge would be; $4 × 4 = $16.
However, he adds an extra $10 onto the total for families with more than three children;
The total charge is therefore; $16 + $10 = $26.
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