M.s. alonso ordered 4,000 markers for her store. Only 1/10 of them arrived
[tex]\frac{1}{10}[/tex] of markers arrived
Ordered markers = 4000
she received = [tex]\frac{1}{10}[/tex] of ordered marker
= [tex]\frac{1}{10}[/tex] * 4000 = [tex]\frac{4000}{10}[/tex]= 400
So, M.s. alonso received 400 markers.