[рони]

<script src="https://cdnjs.cloudflare.com/ajax/libs/collect.js/4.34.0/collect.min.js"></script>
    <script>
        const objCars = {
            'reno': '$15000',
            'audi': '$20000',
            'bmw': '$30000',
            'peogeot': '18000$'
        }

        const total = collect(objCars).sum(value => value.replace(/\D+/g, ''));
        alert(total);
    </script>