Cost for 4 lines with this usage:
line 1: unlimited talk, unlimited text, unlimited data
line 2: unlimited talk, unlimited text, 2GB of data
line 3: unlimited talk, unlimited text, 500MB of data
line 4: unlimited talk, unlimited text, 500MB of data
$80 (first 2 lines) + $10 (3rd line) + $10 (4th line) + $20 (unlimited data for line 1) + $10 (2GB for line 2) = $130
$130 / 4 = $32.5
line 1: unlimited talk, unlimited text, unlimited data
line 2: unlimited talk, unlimited text, 2GB of data
line 3: unlimited talk, unlimited text, 500MB of data
line 4: unlimited talk, unlimited text, 500MB of data
$80 (first 2 lines) + $10 (3rd line) + $10 (4th line) + $20 (unlimited data for line 1) + $10 (2GB for line 2) = $130
$130 / 4 = $32.5