$4-$A house was purchased as follow

a$.$ Down payment of $$150000$

b$.200000$ paid at the end of $2$ years with compound interst of $6\%$ annually

c$.300000$ paid at the end of $5$ years with compound interst of $7\%$ annually

d$.400000$ paid at the end of $10$ years with compound interst of $5\%$ annually

Required

Calculate the current price of this house now

Calculate the discount amount that the owner will get if he paid in cash