Intro of what to accomplish
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\[Price_{NGW}=( 720 hr / month \cdot Num_{VPC} \cdot Cost_{NGW-Attachment} ) + (traffic \cdot Cost_{NGW-Traffic})\]
\[Price_{TGW+NGW}=
( 720 hr / month \cdot Num_{VPC} \cdot Cost_{TGW-Attachment} ) + \\
( 720 hr / month \cdot Num_{AZ} \cdot Cost_{NGW-Attachment} ) + \\
(traffic \cdot ( Cost_{TGW-Traffic} + Cost_{NGW-Traffic}))\]
\[Price_{TGW+NGW} \leq Price_{NGW}\]
\[( 720 hr / month \cdot Num_{VPC} \cdot Cost_{TGW-Attachment} ) + \\
( 720 hr / month \cdot Num_{AZ} \cdot Cost_{NGW-Attachment} ) + \\
(traffic \cdot ( Cost_{TGW-Traffic} + Cost_{NGW-Traffic})) \\
\leq ( 720 hr / month \cdot Num_{VPC} \cdot Cost_{NGW-Attachment} ) + (traffic \cdot Cost_{NGW-Traffic})\]
\[traffic \cdot Cost_{TGW-Traffic} + traffic \cdot Cost_{NGW-Traffic} - traffic \cdot Cost_{NGW-Traffic} \\
\leq ( 720 hr / month \cdot Num_{VPC} \cdot Cost_{NGW-Attachment} ) - \\
( 720 hr / month \cdot Num_{VPC} \cdot Cost_{TGW-Attachment} ) - \\
( 720 hr / month \cdot Num_{AZ} \cdot Cost_{NGW-Attachment} )\]
\[traffic \cdot Cost_{TGW-Traffic} \\
\leq 720 hr / month \cdot (( Num_{VPC} \cdot Num_{AZ} \cdot Cost_{NGW-Attachment} ) \\
- ( Num_{VPC} \cdot Cost_{TGW-Attachment} ) - ( Num_{AZ} \cdot Cost_{NGW-Attachment} ))\]
\[traffic \leq \frac{720 hr / month}{Cost_{TGW-Traffic}} \cdot \\
(( Num_{VPC} \cdot Num_{AZ} \cdot Cost_{NGW-Attachment} ) - \\
( Num_{VPC} \cdot Cost_{TGW-Attachment} ) - ( Num_{AZ} \cdot Cost_{NGW-Attachment} ))\]