To find the extra cost of feeding one additional person, we start with the formula for the cost \( Q \): \(Q = 1.5 + 0.5n\) Calculate the cost for \( n \) \(Q(n) = 1.5 + 0.5n\) Calculate the cost for \( n + 1 \) \(Q(n + 1) = 1.5 + 0.5(n + 1) = 1.5 + 0.5n + 0.5 = 2 + 0.5n\) Find the extra cost \(\text{Extra cost} = Q(n + 1) - Q(n) = (2 + 0.5n) - (1.5 + 0.5n) = 2 - 1.5 = 0.5\) The extra cost of feeding one additional person is \( 0.5 \) Naira. To convert this to kobo (since \( 1 \) Naira = \( 100 \) kobo): \(0.5 \text{ Naira} = 0.5 \times 100 = 50 \text{ kobo}\) Thus, the extra cost of feeding one additional person is \( 50 \) kobo.