The simple interest is calculated using the formula,
[tex]Simple \: Interest = \frac{P×T×R}{100} \: [/tex]
[tex]P=RS. \: \: 75000 \:[/tex]
[tex]T=3 \: months [/tex]
But remember that the in years (per annum).
Converting 3 months to years, we have,
[tex]T = \frac{3}{12} = \frac{1}{4} \: years[/tex]
[tex]R= 4 \frac{1}{4} = \frac{17}{4} [/tex]
Now let us plug in all these values into the simple interest formula,
[tex]Simple \: Interest =RS. \: \frac{75000× \frac{1}{4} × \frac{17}{4} }{100} \: [/tex]
[tex]Simple \: Interest = \:RS. \: \: 796.875 [/tex]