C&A Cleaner uses a five$-$step process to dry clean garments:

ProcessDescriptionTime $($minutes$)$No of WorkersTaggingAttach a number tag on garments for tracking purposes$\mathrm{.}1$ per garment$1$Stain pretreatmentIdentify stains on garments and apply chemicals on the site of a stain$\mathrm{.}5$ per garment$2$Dry cleaningPlace garments in a large drum machine where water$-$free solvents are used to remove traces of dirt and oil$\mathrm{.}50$ per batchn$/$aSpot cleaningIdentify and remove stains that did not come out earlier$\mathrm{.}10$ per garment$5$FinishingPress garments and retag them before placing them in bags for pickup$\mathrm{.}4$ per garment$2$

A garment piece weighs $1$ pound on average. What is the change in capacity $($in garments per minute$)$ of C&A$$s entire dry$-$cleaning process if the batch size increases from $15$ garments to $30$ garments?