Cost$ want to add or decrease and reflect that in the dash

[FaisalBuhmail]

So basically, i'm doing a cost dash that reflects whatever cost i choose from the 100 units=per day per hour rate per cars we rent... 

But the cost for cars for example i have suv and small cars when i choose one suv i want to add a way to double or triple how many suv i want hope it's clear 

[FaisalBuhmail]

What i have now for example cars

unit is : suv:100 per day

and

small car: 50 

And if i choose one unit its only one suv i want to add visual that allow me to add 5 suv for example 

[FaisalBuhmail]