why 145.4 can be written as 145.20 please explain but no spam otherwise you will be reported
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"90% of the mails it marks as spam are indeed spam" -- this part of the question should be a misprint as it gives the asked answer as 90% but this is not consistent with the other data given. Avoiding this part we can solve this question as follows:
10% email are spam, i.e. 90% email are not spam
90% of mail marked as spam is spam, 10% mail marked as spam are not spam
By Bayes theorem the probability that a mail marked spam is really a spam
=Probability of being spam and being detected as spamProbability of being detected as spam=0.1×0.9(0.1×0.9)+(0.9×0.1)=50%
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