, , , , , ( ). : , , , , :
+ = ,
= / ( - )
.
1. . , () 2100 ., , () - 1050 ., , () 15000 . , 15000/ (2500 1050) = 14 . -
(, 25, 40 ) .
2. . , 1 , , 20 , , .
= ( + )/
= (20 . 1050 . + 15 000 .) /20 . = 1800 .
, 1800 . , 20 .
3. . , $21 000, 155 . 100 7 $ , , , $4900. 55 (155 ) $ 11 . , $260).
. ($21000), - ($4900) , , . ( = 21 000 + 4900 = $25 900). , , . , ( ) 100 ( ) . ($11 7 = $77) , . , = ( 100) 77. , $10 , ( = $250), :
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( - 100) $77 + $25 900 = $250,
= 105.
, , 105 . , ($21 000), ($4900), 5 ! ($385).
4. , , , $29 000. - ( ) $130 . 106 ( 155 ). 12 %.
. ($29 000), ( ) - = $130, ( ) = 106 . , :
= ( + )/, = $403.
12 %, 119 , 13 . 13 ( 106 ). , 13 $403 - $130 = $273, 13 273 = 3549 $.
5. ( 10 ) (). - 3 160 , $11 . -154, 160 , - $27 000. 35 %. 10 %.
. , ( , ). , = $27 000 + ($11 160 ) = $44 600, .
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(160 .), :
= (( ) + )/, =
= /
= 44600$/160 . = $279.
(35%), () $377, (10 %) $419.
- ($377) :
= /, = 44 600/377 = 119 .