A million billion is called a quadrillion.
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A billion is a thousand million.
1.2
400 million equates to 0.4 billion.
After 999,999,999,999,999,999,999,999 would come 1,000,000,000,000,000,000,000,000 (10^24) which is called one septillion on the US (short) scale, or quadrillion on the European (long) scale, where a billion is a million million, a trillion is a million billion, and a quadrillion is a million trillion.
1 percent of 40 billion = 400 million 1% of 40 billion= 1% * 40 billion= 0.01 * 40 billion= 400 million