(1+12%)\r=1400+168 =1400X\r112%\r1568 (S) =1568 (S)\r( 5 ) UVWXYZ8!5[\]^_`'\r2.\r:bcde"fgh8C80000i5jeUdekl^ 0. 5%0\r(1\r4\r(2\r(3.\r3J: 80000-80000X0. 5% 3J?80000X\r(1-0. 5%)\r=80000-400\r=80000X99. 5%\r79600 (i) =79600\r(i)\r3.> 8 5\r( 1 ) qrs3tus35vwxxyz{|}~5\r(2\r3
{|-100\r[w20%{|720%{|'\r3
{|-1\r( 3 ) D=:=;`I\r\n\r1 . ¡>¢£9 1 ¤ “¦:¦”£ ð3\r12«!5h¬%®¯I\r2 . ¡>¢«!°±£11\r( 1 ) /²³´5( 2 ) µ¶34I.\r>¢«!°±£5