book Maths Puzzle Numerical Ability

A invests $10,000 for 6 monts, B invests $8,000 for 5 months and C invests $5,000 for a year. What is B's share in a total profit of $12,000?

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{{{1.4x^2+4.9x+2.6=0}}} I need help with solving this equation, too: -27.23+x=9.77