The half-life for the radioactive decay of u-238 is 4.5, Ask an Expert

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The half-life for the radioactive decay of U-238 is 4.5 billion years and is independent of initial concentration. How long will it take for 10% of the U-238 atoms in a sample of U-238 to decay? This equals to 6.8*10^8 a year If a sample of U-238 initially contained 1.5×1018 atoms when the universe was formed 13.8 billion years ago, how many U-238 atoms will it contain today? I keep getting 1.9*10^12. What am I doing wrong?

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