function fareEstimator(ride_time, ride_distance, cost_per_minute, cost_per_mile) {

    var cpm, rT, rD, cpmi, arr;

               rT = ride_time;
               rD = ride_distance;
              cpm = cost_per_minute;
             cpmi = cost_per_mile;
              arr = []
   for(var i in costPerMinute.length){ // two loops are not necessary as I only needed to increment both values at the same time
        var tRE,rE;
  tRE = rT * cpm[i] + rD * cpmi[i] ;
           rE  =  Math.round(tRE * 100)/100 ;
          arr.push(roundEst);


    };

    return arr;
}