x¼$5000 invested at 7%
12,000x¼12,000 5000 ¼7000 invested at 5%
- Letx¼the amount of money invested at 1% and 3x¼the amount of
money invested at 4% andxþ 400 ¼the amount of money invested
at 3%.
1 %xþ 4 %ð 3 xÞþ 3 %ðxþ 400 Þ¼$ 108
0 : 01 xþ 0 : 04 ð 3 xÞþ 0 : 03 ðxþ 400 Þ¼ 108
0 : 01 xþ 0 : 12 xþ 0 : 03 xþ 12 ¼ 108
0 : 16 xþ 12 ¼ 108 12
0 : 16 x¼ 96
0 : 161 x
0 : 161
¼
96
0 : 16
x¼$600 invested at 1%
3 x¼ 3 ð 600 Þ¼$1800 invested at 4%
xþ 400 ¼ 600 þ 400 ¼$1000 invested at 3%
- Letx¼the amount of money to be invested at 4%.
6 %ð$ 3000 Þþ 4 %x¼$ 372
0 : 06 ð 3000 Þþ 0 : 04 x¼ 372
180 þ 0 : 04 x¼ 372
180 180 þ 0 : 04 x¼ 372 180
0 : 04 x¼ 192
0 : 041 x
0 : 041
¼
192
0 : 04
x¼$ 4800
LESSON 15 Solving Finance Problems 171