If-else choosing random option rather than basing choice off of randomly generated number

This code simply doesn't seem to work. I can't seem to figure out why it isn't, but when I run it it seems to choose a random price from the options rather than go off what the temperature actually is. I'm also wondering if there would be a better way to implement what I'm trying to do rather than a huge if-else ladder. Thanks

public static double GetPrice ()
{
    if (temp >= 0 && temp < 50)
    {
        price = 0.50;
    }
    else if (temp >= 50 && temp <= 60)
    {
        price = 0.55;
    }
    else if (temp >= 61 && temp <= 65)
    {
        price = 0.60;
    }
    else if (temp >= 66 && temp <= 70)
    {
        price = 0.65;
    }
    else if (temp >= 71 && temp <= 75)
    {
        price = 0.75;
    }
    else if (temp >= 76 && temp <= 80)
    {
        price = 0.80;
    }
    else if (temp >= 81 && temp <= 85)
    {
        price = 0.85;
    }
    else if (temp >= 86 && temp <= 90)
    {
        price = 0.90;
    }
    else if (temp > 90)
    {
        price = 1.00;
    }

    return price;
}