def price_ticks_away(price, n_ticks):
price_index = PRICES.index(as_dec(price))<EOL>return float(PRICES[price_index + n_ticks])<EOL>
Returns an exact, valid Betfair price that is n_ticks "ticks" away from
    the given price. n_ticks may positive, negative or zero (in which case the
    same price is returned) but if there is no price n_ticks away from the
    given price then an exception will be thrown.

    :param float price: An exact, valid Betfair price
    :param float n_ticks: The number of ticks away from price the new price is
    :returns: An exact, valid Betfair price
    :rtype: float