<PRE><B>Question 1129598</B>
&lt;br&gt;
The problem is VERY badly formulated.&lt;br&gt;
The interest equation is&lt;br&gt;
{{{I = prt}}}&lt;br&gt;
We are given that the interest I is 11900.
We are given that the annual interest rate is 6%.
We are given that the time is 50 days.&lt;br&gt;
We are not told whether we are to use 360 or 365 (or some other number) for the number of days in a year.  Since it is common to use 360, I will do that.&lt;br&gt;
Then our interest equation is&lt;br&gt;
{{{11900 = p(.06)(50/360)}}}
{{{p = 11900/(3/360) = 11900/(1/120) = 11900*120 = 1428000}}}&lt;br&gt;
Using 360 for the number of days in a year, the amount of the principal is (exactly) $1,428,000.&lt;br&gt;
That is not one of the answer choices, although answer choice D is close.; and answer A is in the right ballpark.&lt;br&gt;
But here is where the problem is formulated very badly.&lt;br&gt;
If you convert the 6% annual interest rate to a daily interest rate using 360 days per year and us the decimal approximation 0.00016666, you get answer D.&lt;br&gt;
If you convert the 6% annual interest rate to a daily interest rate using 360 days per year and us the decimal approximation 0.0001666, you get answer A.&lt;br&gt;
But NO DECIMAL APPROXIMATION should be used!  The EXACT answer, using 360 days per year, is $1,428,000.</PRE>