[tex] {\bf \red {\huge{answer : }}}[/tex]
The money increased from 600 pounds to 621 pounds.
621 - 600 = 21
so , the money increased more 21 pounds.
[tex] \pink {\sf{hence , \frac{21}{621} \times 100 }}[/tex]
[tex] \red{= \frac{21}{\cancel{621}} \times \cancel{100 } }[/tex]
[tex] \red{= \frac{21}{\cancel{6.21}} \times \cancel{1 } }[/tex]
[tex] \red{= \frac{\cancel{21}}{\cancel{6.21}} }[/tex]
[tex] \red{= \frac{3 \frac{79}{207} }{1} }[/tex]
[tex] \red{= 3 \frac{79}{207} }[/tex]
Therefore , the dog's weight increased by 3 79/207%
