Javier is a lawyer who used to charge his clients $230 per hour. Javier recently reconsidered his rates and ultimately decided to charge $276 per hour. What was the percent of increase in the billing rate?

To find the percent increase in the billing rate, we first need to calculate the difference between the new rate and the old rate.

Old rate: $230
New rate: $276

Difference = New rate - Old rate
Difference = $276 - $230
Difference = $46

Next, we need to find the percent increase. We can do this by dividing the difference by the old rate and then multiplying by 100 to get the percentage.

Percent increase = (Difference/Old rate) * 100
Percent increase = ($46/$230) * 100
Percent increase = 0.2 * 100
Percent increase = 20%

Therefore, the percent increase in Javier's billing rate is 20%.