<PRE><B>Question 830588</B>
Week     Plan A     Plan B    
1        216+12=228  312+4=316
2        228+12=240  316+4=320
3        240+12=252  320+4=324
4        252+12=264  324+4=328
5        264+12=276  328+4=332
6        276+12=288  332+4=336
7        288+12=300  336+4=340
8        300+12=312  340+4=344
9        312+12=324  344+4=348
10       324+12=336  348+4=352
11       336+12=348  352+4=356
12       348+12=360  356+4=360
.
A faster way is to find the difference in the weekly payment (12-4=8) and the difference in the initial cost (312-216=96) and then divide.
96 / 8 = 12
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