My brother just charged his friend $800 for offering a bet: if the temperature of tomorrow is above 75, my brother will pay 1.5 times $800 to his friend; if the temperature is below 75 tomorrow, my brother will pay 0.5 times $800 to his friend. I do not want my brother to lose money when tomorrow's temperature is above 75 and decide to buy an insurance that will make my brother break even when tomorrow's temperature is above 75 (in other words, the insurance policy will pay my brother 0.5 times $800 when tomorrow's temperature is above 75). If risk free rate is zero, how much should I pay for this insurance (keep two decimal places)?