Answer
Secondary turns = $468,750$.
Work Step by Step
We can set up a ratio as follows:
$(Secondary~Volts/Primary~Volts)=(Secondary~ turns/primary~turns)$.
$(15000/8)=(Secondary~turns/250)$
By cross multiplication, we get:
$15,000*250=$Secondary turns*$8$
We solve:
Secondary turns = $(15,000*250)/8$
Secondary turns = $(3,750,000)/8$.
Secondary turns = $468,750$.
