Silver/gold chest Multipliers

I don’t understand how these multipliers are working or calculating. Right now I am getting 8.33bb crystals. The multiplier(umbrella) is 220%. When the silver chest drops I only get 10.50cc crystals. That is not 220% of 8.33. So where does that come from?

The silver chest contains random quantity of crystals
All you get from this silver chest is: random quantity X 8.33bb X 220%