Percentage from building bridge

An Indian politician went to the US to visit his counterpart. When the Senator invited him home for dinner, the minister was very impressed by the lavish mansion, grounds and the costly furnishings.

He asked "How can you afford all this on a meagre senator's salary?"

The senator smiled knowingly and took him to the window.
"Can you see the river?"
"Yes"
"Can you see the bridge over it?"
"Of course", said the minister.
"10 per cent", said the senator smugly.

Some time later, he had occasion to pay a return visit. The Indian minister lavished all hospitality on him. When they came to his house, the American was stunned by the huge palace the minister had built, glittering with precious art, hundreds of servants etc. etc.

"How can you possibly afford this, on a salary in RS?', he asked.

The minister called him to the window.
"See the river over there?"
"Sure", cried the senator.
"Can you see the bridge over it?"
The senator looked, was confused, peered closely and said - "No, I don't see any bridge."
"100 percent", said the minister!!