Answer :
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
1 kg = 1000g
so, 1 kg of skim milk powder costs $ 6.40
1 gram of skim milk powder costs :
- [tex] \$ \: \: \dfrac{6.40}{1000} [/tex]
now, 250g skim milk powder costs :
- [tex] \dfrac{6.40}{1000} \times 250[/tex]
- [tex] \dfrac{6.40}{4} [/tex]
- [tex]1.60[/tex]
hence, the answer is $ 1.60