To calculate the amount the worker earned before going on vacation, we can use the following formula:
\[ \text{Earnings} = \text{Hourly wage} \times \text{Hours worked per day} \times \text{Number of days worked} \]
Given that the worker earns $10 per hour, works 10 hours a day, and works for 10 days:
\[ \text{Earnings} = 10 , (\text{dollars/hour}) \times 10 , (\text{hours/day}) \times 10 , (\text{days}) \] \[ = 10 \times 10 \times 10 = 1000 , \text{dollars} \]
However, none of the options provided match this total of $1000. Therefore, the worker earned $1000 before going on vacation. It seems the options provided do not correctly capture the earnings calculated.