02. Bike Race

function bikeRace(input) {
    let junior = parseInt(input[0]);
    let senior = parseInt(input[1]);
    let trace = input[2];
    let junSum = 0;
    let senSum = 0;
    let sum = 0;

    if (trace === 'trail') {
        junSum = 5.5;
        senSum = 7;
    } else if (trace === 'cross-country') {
        junSum = 8;
        senSum = 9.5;
    } else if (trace === 'downhill') {
        junSum = 12.25;
        senSum = 13.75;
    } else if (trace === 'road') {
        junSum = 20;
        senSum = 21.5;
    }

    sum = junior * junSum + senior * senSum;

    if (trace === 'cross-country' && junior + senior >= 50) {
        sum = 0.75 * sum;
    }
    console.log(`${(0.95 * sum).toFixed(2)}`);
}