There has been a house on fire. The fireman is now standing in the middle rung of the ladder and trying to extinguish the fire. He climbs 6 rungs more but the heat and deadly flames make him climb down 10 rungs. When the fire settles gradually, he climbs 18 rungs and reaches the top of the ladder for better access to the house.

Calculate the number of rungs in the ladder.

Christina purchased a portable music player for $100 through a deal. She sold it to Sindy for $125. After a year, she bought it back from Sindy at $150. Upon using it for a month, she sold it to Suzzanne for $175.

Can you calculate if this entire deal was profitable or a loss for Christina?