suppose your income is $3000 pizza cost $3 per box and juice cost $6 per box if your income increases from $3000 to $4000 show that what will happen if both pizza and juice are normal good
"n=\\frac{4000\\$}{3000\\$}=1.33,"
pizza: "C_p=3\\$n=4\\$,"
juice: "C_j=6\\$n=8\\$."
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