This equation shows how the money Kensington Middle School spends on workbooks is related to the total number of workbooks they buy:

\[ d = 64.6t \]

The variable \( t \) represents the number of workbooks bought by the school, and the variable \( d \) represents the total cost of those workbooks.

At most, how many workbooks can Kensington Middle School buy if it has $64.60 to spend?