Question 1136731
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You have to buy at least one of each item, so start by buying exactly one of each.  The cost of those is 2+3+5+10 = 20 naira; you have 30 naira left.<br>
If the objective is to buy as many total items as possible, then you want to buy the least expensive items with your remaining 30 naira.  Since sweets cost 2 naira each, you can buy 15 more of them with 30 naira.<br>
So the total number of sweets you bought is 1+15 = 16.