Gross Margin Bridge - Change in Basis Points

Might be a dumb question, but I can't seem to work through the math on this one. Everyone and their mother has created a gross margin bridge and similar bridges.

Can someone share the math with me in regards to how to complete this in basis points?

For instance, if margins increased by 270 bps from PY, how do we take the $$ amounts off the bridge and show the basis point impact of each item. For instance, 30bps increased price, 60 bps better mix, etc.

Thanks.

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Gross Margin Bridge - Change in Basis Points

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