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#1




STAM exercise 323
It seems that I can't make sense of most of these exercises. The ratio seems more like 25 million to 22 million to me, no idea where the 5000/3000 comes from. Rest seems to make sense
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#4




Hi gauchodelpaso,
May I know what are the formulas used to solve this question? I am using the ACTEX Sprig 2018 Exam STAM study manual but I couldn't find the formulas needed to solve this question. Thank you! 
#5




You probably want to look under wherever they cover ILFs. The point is that in computing the pure premium for the 250,000 limit, we want to use only data coming from policies with a limit of at least 250,000, so the first bullet point in the question is not used. Comparing the 2nd and 3rd bullet point, we see that increasing the limit from 50k to 250k increases the losses from 14,000,000 to 25,000,000, so the pure premium increases by a factor of 25,000,000/14,000,000 = 25/14, making the new pure premium (old pure premium) * 25/14 = 240 * 25/14.
From the original numbers, the variable expenses are 10% of the gross premium (30/300), then we plug into the standard formula relating pure premium to gross premium, namely that gross premium = (pure premium + fixed expenses)/(1variable expense ratio) 
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