"Tu=5yx^2"
Budget line "M = P(x) x +P(y)y"
"150 = 50x + 10y"
At optimum :
"\\frac{MU(x)}{P(x)}= \\frac{MU(y)}{P(y)} \\\\\n\nMU(x) = \\frac{\u0394U}{\u0394x} = 10xy \\\\\n\nMU(y) = \\frac{\u0394U}{\u0394y} = 5x^2 \\\\\n\n\\frac{10xy}{50} = \\frac{5x^2}{10} \\\\\n\n\\frac{y}{5} = \\frac{x}{2} \\\\\n\ny=2.5x"
Putting y=2.5x in budget line
"150 = 50 x + 10 \\times 2.5x \\\\\n\n150 = 75x \\\\\n\nx = \\frac{150}{75}=2 \\\\\n\ny= 5"
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