in the late 1930s
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TV cost $1600 more than the phone set. Phone set cost 20% of TV. How much does the phone set cost? 100%-20%=$1600=80% $1600/(80%)=> 1% = $20 20 x 1%=20% 20 x $20=$400 = phone set cost
No. Kilogram is a unit of mass, not of weight.
who invented the first mechanical digital calculator
In 1776
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