Answer:
c
Step-by-step explanation:
328.5
See below
<u>If you just want the tip</u>
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<u>If you want the total bill</u>
Divide 150 by 50 to get 3
LM + MN = LN
7x - 1 + 2x + 4 = 12
9x + 3 = 12
9x = 12 - 3
9x = 9
x = 9/9
x = 1