2yr contract vs att next 18months for family of 4

A

AC Question

can someone check my math for me ( for plans) for a family of 4

2 yr contract w/ corporate discount

192 x 24 = 4608
800 for 4 phones(sales tax due at sale) + 160(activation fee for 4 phones) = 960
=5568

next 18 months not including corporate discount
160 (100 for 10gb, 15 per line) x 24 = 3840
27.09 x 18 [ 27 per month for 18 months ] = 487.62
[1 phone] 487.62 x 4 = 1950.48
=5790.48

is this right? is there anything im missing? also how much would corporate discount be on next if it is 15%?
 

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