Step-by-step explanation: Since 100% of 60 is obviously 60 then 380% will more than triple the amount 60.
So if we multiply 60*3 we get 180.
Then if we again multiply 60 by .80 we wil get the number 48.
Next if we add both values up 180+48 we get the number we're looking for 228.
So in summary always remember that <em>any </em>number that is greater than 100% is gonna get you a number that either triples or doubles the amount you want the percent from. To find a percent, however, you turn your number into a decimal. 100% would be 1. 30% would be 0.30. 80% would be .80 and so on.
If you enter this number into a spreadsheet (with a single E), you can set the display format to show you the value in standard form. The exponent (E) of -8 indicates the most-significant digit (2) is in the 8th place to the right of the decimal point: