Christmas Express makes wreaths in batch sizes of $12.$ The cutting and assembly process takes $8$ minutes per wreath, and the decorating process time is $10$ minutes per wreath. It takes $12$ minutes to move the wreaths from the cutting and assembly process to the decorating process.

a$.$ Compute the value$-$added, non$-$value$-$added, and total lead times of the wreath process.

b$.$ Compute the value$-$added ratio. Round to one decimal place.