Question 977884
<pre>

 0.7
+0.77
+0.777
+0.7777
+0.77777
+0.777777
+0.7777777
+0.77777777
+0.777777777
+0.7777777777
+0.77777777777
+0.777777777777
+0.7777777777777
+0.77777777777777
+0.777777777777777
+0.7777777777777777
+0.77777777777777777
+0.777777777777777777
+0.7777777777777777777
+0.77777777777777777777
-----------------------
15.46913580246913580247   
</pre>