Mock Set 1 Paper 02 Calculator

\begin{aligned} &\text{Let rice cost per kg} = r, \text{ beans cost per kg} = b. \\ &4r = 5.60 \Rightarrow r = 1.40. \\ &3r + 7b = 10.15 \Rightarrow 4.20 + 7b = 10.15 \Rightarrow 7b = 5.95 \Rightarrow b = 0.85. \\ &2r + 6b = 2(1.40) + 6(0.85) = 2.80 + 5.10 = 7.90. \end{aligned}