Mr. Castillo spent $20.00 of the $40.00 in his wallet. Which decimal represents the fraction of the $40.00 Mr. Castillo spent?

0.5

Step-by-step explanation:

From the information given, we are told that Mr. Castillo spent $20.00 of the $40.00 in his wallet.

The decimal that represents the fraction of the $40.00 Mr. Castillo spent will be:

= 20 / 40

= 1/2

= 0.5 as decimal