32s

16s

8s

4s

2s

1s

<< Remember the binary place values, e.g 32s place, 16s place.

Sum the values of those places that contain a '1' digit and ignore those that have a '0' digit.

The value in a particular position that contains a '1', is 1 times the place value. For example, 1 times 4 or 1 times 8.

The answer is Dec