The money raised by Lucas for the fundraiser is $30.
The bars sold on Saturday are 12 bars. Each bar costs $1.50.
So, the amount will be: 12 * 1.50 = 18
The bars sold on Sunday are 8 bars.
So, the amount will be: 8 * 1.50 = 12
Hence, the total amount: is 18+12= 30