Question 622851
In words:
number of pencils bought = ( total spent in cents ) / ( cost/ one pencil in cents )
{{{ 2D }}} dollars x {{{ 100 / 1 }}} cents/dollar = {{{ 200D }}} cents
The cost/ one pencil in cents = {{{ 200D }}} cents
and, since
number of pencils bought = ( total spent in cents ) / ( cost/ one pencil in cents )
number of pencils bought  = {{{ c / ( 200D ) }}}