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NB: values with 10 is to the first power.
0.78 is what you get when you convert 78% to a decimal. You will take the percent sign off and add a 0. In front of it.
It will be the same thing with any other two digit number. Let’s say it is 23% and you want to convert it to a decimal, your answer will be 0.23
Hope this helps!!
Answer:
$4125.
Step-by-step explanation:
When solving for the principal we still need to use the formula
.
Let's take all the variables that we do have available and list them out.
A = $4369.20
r = 3.3% or 0.033
n = 4 (Quarterly)
t = 21 months or 1.75 years
Now we can substitute the values and solve for the principal.





Now we need to divide both sides with 1.05919912849 to get the principal.

P = 4125.00339406 or $4125.
To check for our answer, we can simply substitute the values including the principal and excluding the total.





or 
50(30%) = 15
50 - 15 = 35
35 (6%) = 2.1
35 + 2.1 = $37.10
the total cost of his order is $37.10 !!