The required probability is given by the:
[tex]100\%-\frac{Area\text{ of the shaded rectangle}}{Area\text{ of the largest rectangle}}[/tex]
The area of the largest rectangle:
[tex]5\times10=50\text{ square units}[/tex]
The area of the shaded rectangle:
[tex]4\times2=8\text{ square units}[/tex]
Hence, the required probability is given by:
[tex]100\%-\frac{8}{50}\times100\%=100\%-16\%=84\%[/tex]
Therefore, the required probability is 84%.
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