private function buildQuote(Equipment $equipment, Rate $rate, RentalPeriod $requestedPeriod)
 {
     /** @var RentalPeriod $requestedPeriod */
     /** @var Rate $rate */
     $quantity = ceil($requestedPeriod->getDayCount() / $rate->getUnitDays());
     $quote = new RateQuote($equipment);
     $quote->add(RateQuoteLineItem::make($rate, $quantity));
     return $quote;
 }