Answer:
$142.86
Step-by-step explanation:
Let the bonus be x
This implies that
[tex] \frac{1}{3}x + \frac{1}{4}x = 840[/tex]
Multiplying through by the L. C. M(that is 12)
[tex]12 \times \frac{1}{3}x + 12 \times \frac{1}{4}x = 12 \times 840[/tex]
[tex] \implies4x + 3x=10080[/tex]
[tex] \implies7x=10080[/tex]
Dividing through by 7
[tex]\implies \frac{7x}{7} = \frac{10080}{7} [/tex]
[tex]\implies x=142.86[/tex]
Hence her monthly bonus was $142.86
