Suppose the AC voltage from a power company is 20000v, two transformers are used to step down the voltage. The first transformer has 5000 turns in the primary coil and 250 turns in the secondary coil; the second transformer has 4000 turns in the primary and 800 turns in the secondary coil. If the output of the first transformer is connected to the input of the second transformer, what will be the output of the second transformer.