Answer:

28th December2011 to 22th May 2012=175 days.

here, P=6240, R=20/3%, T=175/375 year

SI=

\frac{prt}{100}

100

prt

\frac{6240 \times 20 \times 175}{3 \times 100 \times 365}

3×100×365

6240×20×175

=194.14

and the amount is (6240+194.14)=6434.14

[tex]SI = \frac{P×R×T}{100} [/tex]

[tex]Principal = 6,240[/tex]

[tex]Rate = 6\frac{2}{3} = \frac{20}{3} [/tex]

[tex]Time = 147 \: days \: or \: 21 \: weeks[/tex]

[tex]SI = \frac{6240 \times 20 \times 21}{3 \times 100} [/tex]

[tex]SI =624 \times 2 \times 7[/tex]

[tex]SI = 624 \times 14[/tex]

[tex]SI = 8,736[/tex]