Verizon share everthing plan?

I have a share everything plan with Verizon and I already have 2 iPhone 5 and a galaxy s3 so a total of 3 lines I'm thinking about adding another line I'm adding the s4 and I was wondering how much it will cost to add a line and if I do how much it will be every month were sharing 8 gb and the phone is 200$ will it be more

It's $40/month, plus tax.

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