An article costing Rs 4000 is sold at a certain profit. If customer purchased it for Rs 5424 with 13% Vat. Find the profit %

  20%

Step-by-step explanation:

The selling price before VAT is added was ...

  (Rs 5424)/(1 +13%) = Rs (5424/1.13) = Rs 4800

The profit is the difference between this price and the cost:

  profit = Rs 4800 -4000 = Rs 800

So, the profit percentage is ...

  profit / cost × 100% = (800/4000)×100% = 20%

The seller made a profit of 20% on the article.

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.

step-by-step explanation: