Answer: 17 pet rocksAssumption -Â Rosa dug the pet rocks in her backyard thus zero cost for inputs.Given:Â Â Selling price/rock -Â $5Rent of table -Â Â Â Â Â $5Package cost/rock - $2X = the minimum number of pet rocks to be sold to gain profit5X=50+2X5X-2X=503X=50X=50/3