Define mass percent of a solution.

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Definition: The concentration of a solution by mass percent may be defined as the number of parts by mass of solute per $100$ part by mass of solution.
$% S t r e n g t h b y M a s s = \frac{M a s s o f s o l u t e}{M a s s o f s o l u t i o n} \times 100$
For example, if a $10$ percent salt solution is prepared by dissolving $10.0 g$ salt in $90.0 g$ water, then the total mass of the solution will be,
$M a s s o f s o l u t i o n = M a s s o f t h e s o l u t e + M a s s o f t h e s o l v e n t = 10 + 90 = 100 g$
$C o n c e n t r a t i o n o f S o l u t i o n (b y M a s s) = \frac{10}{100} \times 100 = 10 %$
As a result, the concentration of the solution of common salt is $10 %$ by mass.

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