$3\mathrm{.}12.$ Given the following data, can an order for $20$ for delivery in week $4$ be accepted? Calculate the On$-$hand inventory $50$

$\backslash$table$[[$Week$,1,2,3,4,5,6,7,8],[\backslash$table$[[$Customer$],[$Orders$]],50,50,30,40,50,40,30,15],[$MPS$,,100,,100,,100,,100],[$ATP$,,,,,,,,],[\backslash$table$[[$Customer$],[$Orders$],[$before Next$],[$MPS $-$ Temp$]],,,,,,,,],[$ATP$,,,,,,,,]]$

Can we accept an order for $20$ for delievery in week $4?$ Why?