when the price of a burger fall from $3 to $1 and other things remain the same,1. the quantity of burgers

demand increases from 200 to 400  an hour,

2. the quantity of fries demand increases from 224 to 375 packets an hour

The cross elasticity  of demand for fries with respect to burgers is  -0.5

I know this is the correct answer I just don’t know the formula used to get this. I tried all different combinations  but could not figure it out

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