12 1/2 % dari 4kuintal adalah kg

[tex]12 \frac{1}{2} \% \times 4 \\ \\ = \frac{25}{2 \times 100} \times 4 \\ \\ = \frac{100}{200} \\ \\ = \frac{1}{2} [/tex]
1 kwuintal = 100 Kg

1/2 kw = 1/2 x 100 kg

= 50 Kg <<=== it's Rock