document.write( "Question 1185151: the cost of telephone service is calculated on three part rates, #14.00 per unit for the first 25 units, #18.00 per unit for the next 50 units, #22.00 per unit for the remainder. if the total amount paid is #1,580.00, find the remaining units \n" ); document.write( "
Algebra.Com's Answer #815912 by Theo(13342)\"\" \"About 
You can put this solution on YOUR website!
the total cost is 1580.
\n" ); document.write( "14 * 25 = 350
\n" ); document.write( "18 * 50 = 900
\n" ); document.write( "total cost so far is 1250.
\n" ); document.write( "remaining amount is 1580 minus 1250 = 330.
\n" ); document.write( "remaining number of units is 330 / 22 = 15.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "your solution is that the remaining units are 15.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "total cost becomes:
\n" ); document.write( "14 * 25 = 350
\n" ); document.write( "18 * 50 = 900
\n" ); document.write( "22 * 15 = 330
\n" ); document.write( "total paid is 1580
\n" ); document.write( "
\n" );