The marked price of a watch was 30% above the cost price. When it is sold allowing 20% discount on it, there
was a gain of Rs. 150. Find the marked price and cost
price of the watch.
​

m∠abd = m∠dbc

step-by-step explanation:

given : ab bisects ∠dbc

as we know that bisection means ab divides   ∠dbc   in two equal angles named as   ∠dba and   ∠abc

so, m∠abd = m∠dbc  

because ab bisects ∠dbc.

hence , the first statement m∠abd = m∠dbc is true.

hd extra 3-7 x d en is the answer