# Chapters 1-9 - Cumulative Review Exercises: 30

The total amount charged to Portia's credit card is around $31.91 dollars. #### Work Step by Step 1. Cost of the two CDs Let$C=$cost of the two CDs$C = 2 \times 14.98C = 29.96$dollars 2. Cost of the CD tax Let$T =$cost of the CD tax (per CD)$T = 14.98 \times \frac{6.5}{100}T = 14.98 \times .065T = 0.9737$dollars per CD (tax) Therefore the TOTAL tax for the TWO CDs is$ = 0.9737 \times 2 = 1.9474$dollars 3. Adding up the cost of the CD and the taxes for it Let$x =$total amount charged to Portia's credit card$x = 29.96 + 1.9474x = 31.9074$dollars$x \approx 31.91\$ dollars

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