Answer:
C. 180d.
Step-by-step explanation:
Let d represent the number of days.
We have been given that Eric has a coupon for 20% off the daily base rate of $200.
To find the daily base rate after discount we need to figure out 80% of $200 as 100%-20%=80%.
[tex]\text{The daily base rate after discount}=\frac{80}{100}\times \$200[/tex]
[tex]\text{The daily base rate after discount}=0.80\times \$200[/tex]
[tex]\text{The daily base rate after discount}=\$160[/tex]
Since Eric will also have to pay an additional $20 a day for utilities, so the total cost for one day will be equal to daily base rate after discount plus additional charges.
[tex]\text{Total cost for one day}=\$160+\$20[/tex]
[tex]\text{Total cost for one day}=\$180[/tex]
As cost of one day is $180, therefore, the cost for d days will be 180d and option C is the correct choice.
