Converting 8421 BCD to binary

[TsAmE]

Convert 0110.01110101 (8421 BCD) to binary

The only thing that I know is that 8421 BCD represents the numbers 0..9.
What would be the procedure to do this calculation?

 

[MikeMl]

Presumably, 0110.01110101 should be written 0110/0111/0101, where each group of four represents a decimal digit?

X = 0110b = 2^2 + 2^1 = 6

I'll let you do these:
Y = 0111b = ?
Z = 0101b = ?

So the decimal value is D = 100X +10Y + Z = ?

Now convert D to binary.