Part (a) was reported to be well attempted by majority of the candidates. They were able to draw the required Venn diagram correctly and were also able to determine the number who offered History only and Geography only correctly. Candidates were expected to draw the Venn diagram thus:
From the diagram, n(H) only = 30 - 15 = 15.
n(G only) = 50 - 30 - 3 = 17
In part (b), candidates' performance was reported to be poor. Their responses were reported to indicate candidates' poor understanding of transactions involving discounts. They were expected to show that if 8% discount was given, then N 828.00 is equal to 92% of the marked price. Therefore, the marked price = N 828 x100                                                                                                                                                                                              92
= N 900.00. Since it was initially marked to gain 25%, it implied that N 900 = 125% of the cost price. Hence the cost price =  900     =  900 x100
                 125        125%
                                                          
which gave N 720.00. The discount allowed = N (900 - 828) = N 72.00.